GitHub/MotorolaMobilityLLC/kernel-slsi.git
13 years agoperf, powerpc: Handle events that raise an exception without overflowing
Anton Blanchard [Wed, 9 Mar 2011 03:38:42 +0000 (14:38 +1100)]
perf, powerpc: Handle events that raise an exception without overflowing

Events on POWER7 can roll back if a speculative event doesn't
eventually complete. Unfortunately in some rare cases they will
raise a performance monitor exception. We need to catch this to
ensure we reset the PMC. In all cases the PMC will be 256 or less
cycles from overflow.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org> # as far back as it applies cleanly
LKML-Reference: <20110309143842.6c22845e@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoperf, x86: Use INTEL_*_CONSTRAINT() for all PEBS event constraints
Lin Ming [Wed, 9 Mar 2011 15:21:29 +0000 (23:21 +0800)]
perf, x86: Use INTEL_*_CONSTRAINT() for all PEBS event constraints

PEBS_EVENT_CONSTRAINT() is just a duplicate of INTEL_UEVENT_CONSTRAINT().
Remove it and use INTEL_UEVENT_CONSTRAINT() instead.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1299684089-22835-3-git-send-email-ming.m.lin@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoperf, x86: Clean up SandyBridge PEBS events
Lin Ming [Wed, 9 Mar 2011 15:21:28 +0000 (23:21 +0800)]
perf, x86: Clean up SandyBridge PEBS events

Use INTEL_EVENT_CONSTRAINT() for the events where all umasks support PEBS.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1299684089-22835-2-git-send-email-ming.m.lin@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoMerge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux...
Ingo Molnar [Wed, 16 Mar 2011 12:42:48 +0000 (13:42 +0100)]
Merge branch 'perf/core' of git://git./linux/kernel/git/acme/linux-2.6 into perf/urgent

13 years agoMerge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 03:01:36 +0000 (20:01 -0700)]
Merge branch 'x86-platform-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (27 commits)
  x86: Clean up apic.c and apic.h
  x86: Remove superflous goal definition of tsc_sync
  x86: dt: Correct local apic documentation in device tree bindings
  x86: dt: Cleanup local apic setup
  x86: dt: Fix OLPC=y/INTEL_CE=n build
  rtc: cmos: Add OF bindings
  x86: ce4100: Use OF to setup devices
  x86: ioapic: Add OF bindings for IO_APIC
  x86: dtb: Add generic bus probe
  x86: dtb: Add support for PCI devices backed by dtb nodes
  x86: dtb: Add device tree support for HPET
  x86: dtb: Add early parsing of IO_APIC
  x86: dtb: Add irq domain abstraction
  x86: dtb: Add a device tree for CE4100
  x86: Add device tree support
  x86: e820: Remove conditional early mapping in parse_e820_ext
  x86: OLPC: Make OLPC=n build again
  x86: OLPC: Remove extra OLPC_OPENFIRMWARE_DT indirection
  x86: OLPC: Cleanup config maze completely
  x86: OLPC: Hide OLPC_OPENFIRMWARE config switch
  ...

Fix up conflicts in arch/x86/platform/ce4100/ce4100.c

13 years agoMerge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:49:10 +0000 (19:49 -0700)]
Merge branch 'x86-mm-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (93 commits)
  x86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()
  x86-64, NUMA: Don't call numa_set_distanc() for all possible node combinations during emulation
  x86-64, NUMA: Don't assume phys node 0 is always online in numa_emulation()
  x86-64, NUMA: Clean up initmem_init()
  x86-64, NUMA: Fix numa_emulation code with node0 without RAM
  x86-64, NUMA: Revert NUMA affine page table allocation
  x86: Work around old gas bug
  x86-64, NUMA: Better explain numa_distance handling
  x86-64, NUMA: Fix distance table handling
  mm: Move early_node_map[] reverse scan helpers under HAVE_MEMBLOCK
  x86-64, NUMA: Fix size of numa_distance array
  x86: Rename e820_table_* to pgt_buf_*
  bootmem: Move __alloc_memory_core_early() to nobootmem.c
  bootmem: Move contig_page_data definition to bootmem.c/nobootmem.c
  bootmem: Separate out CONFIG_NO_BOOTMEM code into nobootmem.c
  x86-64, NUMA: Seperate out numa_alloc_distance() from numa_set_distance()
  x86-64, NUMA: Add proper function comments to global functions
  x86-64, NUMA: Move NUMA emulation into numa_emulation.c
  x86-64, NUMA: Prepare numa_emulation() for moving NUMA emulation into a separate file
  x86-64, NUMA: Do not scan two times for setup_node_bootmem()
  ...

Fix up conflicts in arch/x86/kernel/smpboot.c

13 years agoMerge branch 'x86-mem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:41:42 +0000 (19:41 -0700)]
Merge branch 'x86-mem-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-mem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86-64, mem: Convert memmove() to assembly file and fix return value bug

13 years agoMerge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 02:40:53 +0000 (19:40 -0700)]
Merge branch 'x86-microcode-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, microcode, AMD: Fix signedness bug in generic_load_microcode()
  x86, microcode, AMD: Extend ucode size verification
  x86, microcode, AMD: Cleanup dmesg output
  x86, microcode, AMD: Remove unneeded memset call
  x86, microcode, AMD: Simplify get_next_ucode
  x86, microcode, AMD: Simplify install_equiv_cpu_table
  x86, microcode, AMD: Release firmware on error
  x86, microcode: Correct sysdev_add error path

13 years agoMerge branch 'um-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:40:35 +0000 (19:40 -0700)]
Merge branch 'um-irq-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'um-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  um: Select GENERIC_HARDIRQS_NO_DEPRECATED
  um: Use proper accessors in show_interrupts()
  um: Convert irq_chips to new functions
  um: Remove stale irq_chip.end

13 years agoMerge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:23:40 +0000 (19:23 -0700)]
Merge branch 'irq-core-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (116 commits)
  x86: Enable forced interrupt threading support
  x86: Mark low level interrupts IRQF_NO_THREAD
  x86: Use generic show_interrupts
  x86: ioapic: Avoid redundant lookup of irq_cfg
  x86: ioapic: Use new move_irq functions
  x86: Use the proper accessors in fixup_irqs()
  x86: ioapic: Use irq_data->state
  x86: ioapic: Simplify irq chip and handler setup
  x86: Cleanup the genirq name space
  genirq: Add chip flag to force mask on suspend
  genirq: Add desc->irq_data accessor
  genirq: Add comments to Kconfig switches
  genirq: Fixup fasteoi handler for oneshot mode
  genirq: Provide forced interrupt threading
  sched: Switch wait_task_inactive to schedule_hrtimeout()
  genirq: Add IRQF_NO_THREAD
  genirq: Allow shared oneshot interrupts
  genirq: Prepare the handling of shared oneshot interrupts
  genirq: Make warning in handle_percpu_event useful
  x86: ioapic: Move trigger defines to io_apic.h
  ...

Fix up trivial(?) conflicts in arch/x86/pci/xen.c due to genirq name
space changes clashing with the Xen cleanups.  The set_irq_msi() had
moved to xen_bind_pirq_msi_to_irq().

13 years agoMerge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:16:00 +0000 (19:16 -0700)]
Merge branch 'x86-debug-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Combine printk()s in show_regs_common()
  x86: Don't call dump_stack() from arch_trigger_all_cpu_backtrace_handler()

13 years agoMerge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 02:00:53 +0000 (19:00 -0700)]
Merge branch 'x86-cpu-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Fix and clean up generic_processor_info()
  x86: Don't copy per_cpu cpuinfo for BSP two times
  x86: Move llc_shared_map out of cpu_info

13 years agoMerge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 01:59:56 +0000 (18:59 -0700)]
Merge branch 'x86-asm-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, binutils, xen: Fix another wrong size directive
  x86: Remove dead config option X86_CPU
  x86: Really print supported CPUs if PROCESSOR_SELECT=y
  x86: Fix a bogus unwind annotation in lib/semaphore_32.S
  um, x86-64: Fix UML build after adding CFI annotations to lib/rwsem_64.S
  x86: Remove unused bits from lib/thunk_*.S
  x86: Use {push,pop}_cfi in more places
  x86-64: Add CFI annotations to lib/rwsem_64.S
  x86, asm: Cleanup unnecssary macros in asm-offsets.c
  x86, system.h: Drop unused __SAVE/__RESTORE macros
  x86: Use bitmap library functions
  x86: Partly unify asm-offsets_{32,64}.c
  x86: Reduce back the alignment of the per-CPU data section

13 years agoMerge branch 'timers-rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 01:59:21 +0000 (18:59 -0700)]
Merge branch 'timers-rtc-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'timers-rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  RTC: Fix up rtc.txt documentation to reflect changes to generic rtc layer
  RTC: sa1100: Update the sa1100 RTC driver.
  RTC: Fix the cross interrupt issue on rtc-test.
  RTC: Remove UIE and PIE information from the sa1100 driver proc.
  RTC: Include information about UIE and PIE in RTC driver proc.
  RTC: Clean out UIE icotl implementations
  RTC: Cleanup rtc_class_ops->update_irq_enable()
  RTC: Cleanup rtc_class_ops->irq_set_freq()
  RTC: Cleanup rtc_class_ops->irq_set_state
  RTC: Initialize kernel state from RTC

13 years agoMerge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 01:53:35 +0000 (18:53 -0700)]
Merge branch 'timers-core-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (62 commits)
  posix-clocks: Check write permissions in posix syscalls
  hrtimer: Remove empty hrtimer_init_hres_timer()
  hrtimer: Update hrtimer->state documentation
  hrtimer: Update base[CLOCK_BOOTTIME].offset correctly
  timers: Export CLOCK_BOOTTIME via the posix timers interface
  timers: Add CLOCK_BOOTTIME hrtimer base
  time: Extend get_xtime_and_monotonic_offset() to also return sleep
  time: Introduce get_monotonic_boottime and ktime_get_boottime
  hrtimers: extend hrtimer base code to handle more then 2 clockids
  ntp: Remove redundant and incorrect parameter check
  mn10300: Switch do_timer() to xtimer_update()
  posix clocks: Introduce dynamic clocks
  posix-timers: Cleanup namespace
  posix-timers: Add support for fd based clocks
  x86: Add clock_adjtime for x86
  posix-timers: Introduce a syscall for clock tuning.
  time: Splitout compat timex accessors
  ntp: Add ADJ_SETOFFSET mode bit
  time: Introduce timekeeping_inject_offset
  posix-timer: Update comment
  ...

Fix up new system-call-related conflicts in
arch/x86/ia32/ia32entry.S
arch/x86/include/asm/unistd_32.h
arch/x86/include/asm/unistd_64.h
arch/x86/kernel/syscall_table_32.S
(name_to_handle_at()/open_by_handle_at() vs clock_adjtime()), and some
due to movement of get_jiffies_64() in:
kernel/time.c

13 years agoMerge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 01:37:30 +0000 (18:37 -0700)]
Merge branch 'sched-core-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits)
  sched: Resched proper CPU on yield_to()
  sched: Allow users with sufficient RLIMIT_NICE to change from SCHED_IDLE policy
  sched: Allow SCHED_BATCH to preempt SCHED_IDLE tasks
  sched: Clean up the IRQ_TIME_ACCOUNTING code
  sched: Add #ifdef around irq time accounting functions
  sched, autogroup: Stop claiming ownership of the root task group
  sched, autogroup: Stop going ahead if autogroup is disabled
  sched, autogroup, sysctl: Use proc_dointvec_minmax() instead
  sched: Fix the group_imb logic
  sched: Clean up some f_b_g() comments
  sched: Clean up remnants of sd_idle
  sched: Wholesale removal of sd_idle logic
  sched: Add yield_to(task, preempt) functionality
  sched: Use a buddy to implement yield_task_fair()
  sched: Limit the scope of clear_buddies
  sched: Check the right ->nr_running in yield_task_fair()
  sched: Avoid expensive initial update_cfs_load(), on UP too
  sched: Fix switch_from_fair()
  sched: Simplify the idle scheduling class
  softirqs: Account ksoftirqd time as cpustat softirq
  ...

13 years agoMerge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Wed, 16 Mar 2011 01:31:30 +0000 (18:31 -0700)]
Merge branch 'perf-core-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (184 commits)
  perf probe: Clean up probe_point_lazy_walker() return value
  tracing: Fix irqoff selftest expanding max buffer
  tracing: Align 4 byte ints together in struct tracer
  tracing: Export trace_set_clr_event()
  tracing: Explain about unstable clock on resume with ring buffer warning
  ftrace/graph: Trace function entry before updating index
  ftrace: Add .ref.text as one of the safe areas to trace
  tracing: Adjust conditional expression latency formatting.
  tracing: Fix event alignment: skb:kfree_skb
  tracing: Fix event alignment: mce:mce_record
  tracing: Fix event alignment: kvm:kvm_hv_hypercall
  tracing: Fix event alignment: module:module_request
  tracing: Fix event alignment: ftrace:context_switch and ftrace:wakeup
  tracing: Remove lock_depth from event entry
  perf header: Stop using 'self'
  perf session: Use evlist/evsel for managing perf.data attributes
  perf top: Don't let events to eat up whole header line
  perf top: Fix events overflow in top command
  ring-buffer: Remove unused #include <linux/trace_irq.h>
  tracing: Add an 'overwrite' trace_option.
  ...

13 years agoMerge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 01:28:30 +0000 (18:28 -0700)]
Merge branch 'core-locking-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  rtmutex: tester: Remove the remaining BKL leftovers
  lockdep/timers: Explain in detail the locking problems del_timer_sync() may cause
  rtmutex: Simplify PI algorithm and make highest prio task get lock
  rwsem: Remove redundant asmregparm annotation
  rwsem: Move duplicate function prototypes to linux/rwsem.h
  rwsem: Unify the duplicate rwsem_is_locked() inlines
  rwsem: Move duplicate init macros and functions to linux/rwsem.h
  rwsem: Move duplicate struct rwsem declaration to linux/rwsem.h
  x86: Cleanup rwsem_count_t typedef
  rwsem: Cleanup includes
  locking: Remove deprecated lock initializers
  cred: Replace deprecated spinlock initialization
  kthread: Replace deprecated spinlock initialization
  xtensa: Replace deprecated spinlock initialization
  um: Replace deprecated spinlock initialization
  sparc: Replace deprecated spinlock initialization
  mips: Replace deprecated spinlock initialization
  cris: Replace deprecated spinlock initialization
  alpha: Replace deprecated spinlock initialization
  rtmutex-tester: Remove BKL tests

13 years agoMerge branch 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Wed, 16 Mar 2011 01:23:52 +0000 (18:23 -0700)]
Merge branch 'core-futexes-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()
  futex: Deobfuscate handle_futex_death()
  plist: Add priority list test
  plist: Shrink struct plist_head
  futex,plist: Remove debug lock assignment from plist_node
  futex,plist: Pass the real head of the priority list to plist_del()
  futex: Sanitize futex ops argument types
  futex: Sanitize cmpxchg_futex_value_locked API
  futex: Remove redundant pagefault_disable in futex_atomic_cmpxchg_inatomic()
  futex: Avoid redudant evaluation of task_pid_vnr()
  futex: Update futex_wait_setup comments about locking

13 years agoMerge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Wed, 16 Mar 2011 01:23:25 +0000 (18:23 -0700)]
Merge branch 'core-debugobjects-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  debugobjects: Add hint for better object identification

13 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
Linus Torvalds [Tue, 15 Mar 2011 22:48:13 +0000 (15:48 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (57 commits)
  tidy the trailing symlinks traversal up
  Turn resolution of trailing symlinks iterative everywhere
  simplify link_path_walk() tail
  Make trailing symlink resolution in path_lookupat() iterative
  update nd->inode in __do_follow_link() instead of after do_follow_link()
  pull handling of one pathname component into a helper
  fs: allow AT_EMPTY_PATH in linkat(), limit that to CAP_DAC_READ_SEARCH
  Allow passing O_PATH descriptors via SCM_RIGHTS datagrams
  readlinkat(), fchownat() and fstatat() with empty relative pathnames
  Allow O_PATH for symlinks
  New kind of open files - "location only".
  ext4: Copy fs UUID to superblock
  ext3: Copy fs UUID to superblock.
  vfs: Export file system uuid via /proc/<pid>/mountinfo
  unistd.h: Add new syscalls numbers to asm-generic
  x86: Add new syscalls for x86_64
  x86: Add new syscalls for x86_32
  fs: Remove i_nlink check from file system link callback
  fs: Don't allow to create hardlink for deleted file
  vfs: Add open by file handle support
  ...

13 years agoVFS: Fix the nfs sillyrename regression in kernel 2.6.38
Trond Myklebust [Tue, 15 Mar 2011 17:36:43 +0000 (13:36 -0400)]
VFS: Fix the nfs sillyrename regression in kernel 2.6.38

The new vfs locking scheme introduced in 2.6.38 breaks NFS sillyrename
because the latter relies on being able to determine the parent
directory of the dentry in the ->iput() callback in order to send the
appropriate unlink rpc call.

Looking at the code that cares about races with dput(), there doesn't
seem to be anything that specifically uses d_parent as a test for
whether or not there is a race:
  - __d_lookup_rcu(), __d_lookup() all test for d_hashed() after d_parent
  - shrink_dcache_for_umount() is safe since nothing else can rearrange
    the dentries in that super block.
  - have_submount(), select_parent() and d_genocide() can test for a
    deletion if we set the DCACHE_DISCONNECTED flag when the dentry
    is removed from the parent's d_subdirs list.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org (2.6.38, needs commit c826cb7dfce8 "dcache.c:
create helper function for duplicated functionality" )
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agodcache.c: create helper function for duplicated functionality
Linus Torvalds [Tue, 15 Mar 2011 22:29:21 +0000 (15:29 -0700)]
dcache.c: create helper function for duplicated functionality

This creates a helper function for he "try to ascend into the parent
directory" case, which was written out in triplicate before.  With all
the locking and subtle sequence number stuff, we really don't want to
duplicate that kind of code.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agotidy the trailing symlinks traversal up
Al Viro [Tue, 15 Mar 2011 02:20:34 +0000 (22:20 -0400)]
tidy the trailing symlinks traversal up

* pull the handling of current->total_link_count into
__do_follow_link()
* put the common "do ->put_link() if needed and path_put() the link"
  stuff into a helper (put_link(nd, link, cookie))
* rename __do_follow_link() to follow_link(), while we are at it

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoTurn resolution of trailing symlinks iterative everywhere
Al Viro [Tue, 15 Mar 2011 01:54:55 +0000 (21:54 -0400)]
Turn resolution of trailing symlinks iterative everywhere

The last remaining place (resolution of nested symlink) converted
to the loop of the same kind we have in path_lookupat() and
path_openat().

Note that we still *do* have a recursion in pathname resolution;
can't avoid it, really.  However, it's strictly for nested symlinks
now - i.e. ones in the middle of a pathname.

link_path_walk() has lost the tail now - it always walks everything
except the last component.

do_follow_link() renamed to nested_symlink() and moved down.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agosimplify link_path_walk() tail
Al Viro [Tue, 15 Mar 2011 01:28:04 +0000 (21:28 -0400)]
simplify link_path_walk() tail

Now that link_path_walk() is called without LOOKUP_PARENT
only from do_follow_link(), we can simplify the checks in
last component handling.  First of all, checking if we'd
arrived to a directory is not needed - the caller will check
it anyway.  And LOOKUP_FOLLOW is guaranteed to be there,
since we only get to that place with nd->depth > 0.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoMake trailing symlink resolution in path_lookupat() iterative
Al Viro [Mon, 14 Mar 2011 23:54:59 +0000 (19:54 -0400)]
Make trailing symlink resolution in path_lookupat() iterative

Now the only caller of link_path_walk() that does *not* pass
LOOKUP_PARENT is do_follow_link()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoupdate nd->inode in __do_follow_link() instead of after do_follow_link()
Al Viro [Tue, 15 Mar 2011 00:01:51 +0000 (20:01 -0400)]
update nd->inode in __do_follow_link() instead of after do_follow_link()

... and note that we only need to do it for LAST_BIND symlinks

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agopull handling of one pathname component into a helper
Al Viro [Sun, 13 Mar 2011 23:58:58 +0000 (19:58 -0400)]
pull handling of one pathname component into a helper

new helper: walk_component().  Handles everything except symlinks;
returns negative on error, 0 on success and 1 on symlinks we decided
to follow.  Drops out of RCU mode on such symlinks.

link_path_walk() and do_last() switched to using that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agofs: allow AT_EMPTY_PATH in linkat(), limit that to CAP_DAC_READ_SEARCH
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:42 +0000 (18:43 +0530)]
fs: allow AT_EMPTY_PATH in linkat(), limit that to CAP_DAC_READ_SEARCH

We don't want to allow creation of private hardlinks by different application
using the fd passed to them via SCM_RIGHTS. So limit the null relative name
usage in linkat syscall to CAP_DAC_READ_SEARCH

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
13 years agoperf probe: Clean up probe_point_lazy_walker() return value
Ingo Molnar [Tue, 15 Mar 2011 19:51:09 +0000 (20:51 +0100)]
perf probe: Clean up probe_point_lazy_walker() return value

Newer compilers (gcc 4.6) complains about:

        return ret < 0 ?: 0;

For the following reason:

  util/probe-finder.c: In function â€˜probe_point_lazy_walker’:
  util/probe-finder.c:1331:18: error: the omitted middle operand in ?: will always be â€˜true’, suggest explicit middle operand [-Werror=parentheses]

And indeed the return value is a somewhat obscure (but correct) value
of 'true', so return 'ret' instead - this is cleaner and unconfuses
GCC as well.

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoMerge branch 'for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm
Linus Torvalds [Tue, 15 Mar 2011 17:59:09 +0000 (10:59 -0700)]
Merge branch 'for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm

* 'for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm:
  xen: suspend: remove xen_hvm_suspend
  xen: suspend: pull pre/post suspend hooks out into suspend_info
  xen: suspend: move arch specific pre/post suspend hooks into generic hooks
  xen: suspend: refactor non-arch specific pre/post suspend hooks
  xen: suspend: add "arch" to pre/post suspend hooks
  xen: suspend: pass extra hypercall argument via suspend_info struct
  xen: suspend: refactor cancellation flag into a structure
  xen: suspend: use HYPERVISOR_suspend for PVHVM case instead of open coding
  xen: switch to new schedop hypercall by default.
  xen: use new schedop interface for suspend
  xen: do not respond to unknown xenstore control requests
  xen: fix compile issue if XEN is enabled but XEN_PVHVM is disabled
  xen: PV on HVM: support PV spinlocks and IPIs
  xen: make the ballon driver work for hvm domains
  xen-blkfront: handle Xen major numbers other than XENVBD
  xen: do not use xen_info on HVM, set pv_info name to "Xen HVM"
  xen: no need to delay xen_setup_shutdown_event for hvm guests anymore

13 years agoMerge branches 'stable/ia64', 'stable/blkfront-cleanup' and 'stable/cleanup' of git...
Linus Torvalds [Tue, 15 Mar 2011 17:49:16 +0000 (10:49 -0700)]
Merge branches 'stable/ia64', 'stable/blkfront-cleanup' and 'stable/cleanup' of git://git./linux/kernel/git/konrad/xen

* 'stable/ia64' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: ia64 build broken due to "xen: switch to new schedop hypercall by default."

* 'stable/blkfront-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: Union the blkif_request request specific fields

* 'stable/cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: annotate functions which only call into __init at start of day
  xen p2m: annotate variable which appears unused
  xen: events: mark cpu_evtchn_mask_p as __refdata

13 years agoMerge branch 'stable/irq.cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Tue, 15 Mar 2011 17:47:56 +0000 (10:47 -0700)]
Merge branch 'stable/irq.cleanup' of git://git./linux/kernel/git/konrad/xen

* 'stable/irq.cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: events: remove dom0 specific xen_create_msi_irq
  xen: events: use xen_bind_pirq_msi_to_irq from xen_create_msi_irq
  xen: events: push set_irq_msi down into xen_create_msi_irq
  xen: events: update pirq_to_irq in xen_create_msi_irq
  xen: events: refactor xen_create_msi_irq slightly
  xen: events: separate MSI PIRQ allocation from PIRQ binding to IRQ
  xen: events: assume PHYSDEVOP_get_free_pirq exists
  xen: pci: collapse apic_register_gsi_xen_hvm and xen_hvm_register_pirq
  xen: events: return irq from xen_allocate_pirq_msi
  xen: events: drop XEN_ALLOC_IRQ flag to xen_allocate_pirq_msi
  xen: events: do not leak IRQ from xen_allocate_pirq_msi when no pirq available.
  xen: pci: only define xen_initdom_setup_msi_irqs if CONFIG_XEN_DOM0

13 years agoMerge branches 'stable/irq.rework' and 'stable/pcifront-fixes' of git://git.kernel...
Linus Torvalds [Tue, 15 Mar 2011 17:47:16 +0000 (10:47 -0700)]
Merge branches 'stable/irq.rework' and 'stable/pcifront-fixes' of git://git./linux/kernel/git/konrad/xen

* 'stable/irq.rework' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/irq: Cleanup up the pirq_to_irq for DomU PV PCI passthrough guests as well.
  xen: Use IRQF_FORCE_RESUME
  xen/timer: Missing IRQF_NO_SUSPEND in timer code broke suspend.
  xen: Fix compile error introduced by "switch to new irq_chip functions"
  xen: Switch to new irq_chip functions
  xen: Remove stale irq_chip.end
  xen: events: do not free legacy IRQs
  xen: events: allocate GSIs and dynamic IRQs from separate IRQ ranges.
  xen: events: add xen_allocate_irq_{dynamic, gsi} and xen_free_irq
  xen:events: move find_unbound_irq inside CONFIG_PCI_MSI
  xen: handled remapped IRQs when enabling a pcifront PCI device.
  genirq: Add IRQF_FORCE_RESUME

* 'stable/pcifront-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  pci/xen: When free-ing MSI-X/MSI irq->desc also use generic code.
  pci/xen: Cleanup: convert int** to int[]
  pci/xen: Use xen_allocate_pirq_msi instead of xen_allocate_pirq
  xen-pcifront: Sanity check the MSI/MSI-X values
  xen-pcifront: don't use flush_scheduled_work()

13 years agoMerge branches 'stable/p2m-identity.v4.9.1' and 'stable/e820' of git://git.kernel...
Linus Torvalds [Tue, 15 Mar 2011 17:32:15 +0000 (10:32 -0700)]
Merge branches 'stable/p2m-identity.v4.9.1' and 'stable/e820' of git://git./linux/kernel/git/konrad/xen

* 'stable/p2m-identity.v4.9.1' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/m2p: Check whether the MFN has IDENTITY_FRAME bit set..
  xen/m2p: No need to catch exceptions when we know that there is no RAM
  xen/debug: WARN_ON when identity PFN has no _PAGE_IOMAP flag set.
  xen/debugfs: Add 'p2m' file for printing out the P2M layout.
  xen/setup: Set identity mapping for non-RAM E820 and E820 gaps.
  xen/mmu: WARN_ON when racing to swap middle leaf.
  xen/mmu: Set _PAGE_IOMAP if PFN is an identity PFN.
  xen/mmu: Add the notion of identity (1-1) mapping.
  xen: Mark all initial reserved pages for the balloon as INVALID_P2M_ENTRY.

* 'stable/e820' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/e820: Don't mark balloon memory as E820_UNUSABLE when running as guest and fix overflow.
  xen/setup: Inhibit resource API from using System RAM E820 gaps as PCI mem gaps.

13 years agoperf evlist: New command to list the names of events present in a perf.data file
Arnaldo Carvalho de Melo [Tue, 15 Mar 2011 14:04:13 +0000 (11:04 -0300)]
perf evlist: New command to list the names of events present in a perf.data file

[root@emilia ~]# perf record -a -e sched:* -e timer:timer* sleep 5
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.172 MB perf.data (~7530 samples) ]
[root@emilia ~]# perf evlist
sched:sched_kthread_stop
sched:sched_kthread_stop_ret
sched:sched_wakeup
sched:sched_wakeup_new
sched:sched_switch
sched:sched_migrate_task
sched:sched_process_free
sched:sched_process_exit
sched:sched_wait_task
sched:sched_process_wait
sched:sched_process_fork
sched:sched_stat_wait
sched:sched_stat_sleep
sched:sched_stat_iowait
sched:sched_stat_runtime
sched:sched_pi_setprio
timer:timer_init
timer:timer_start
timer:timer_expire_entry
timer:timer_expire_exit
timer:timer_cancel
[root@emilia ~]#

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agox86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()
Xiao Guangrong [Tue, 15 Mar 2011 01:57:37 +0000 (09:57 +0800)]
x86, tlb, UV: Do small micro-optimization for native_flush_tlb_others()

native_flush_tlb_others() is called from:

 flush_tlb_current_task()
 flush_tlb_mm()
 flush_tlb_page()

All these functions disable preemption explicitly, so we can use
smp_processor_id() instead of get_cpu() and put_cpu().

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Cliff Wickman <cpw@sgi.com>
LKML-Reference: <4D7EC791.4040003@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoMerge commit 'v2.6.38' into x86/mm
Ingo Molnar [Tue, 15 Mar 2011 07:29:44 +0000 (08:29 +0100)]
Merge commit 'v2.6.38' into x86/mm

Conflicts:
arch/x86/mm/numa_64.c

Merge reason: Resolve the conflict, update the branch to .38.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 years agoAllow passing O_PATH descriptors via SCM_RIGHTS datagrams
Al Viro [Sun, 13 Mar 2011 21:08:22 +0000 (17:08 -0400)]
Allow passing O_PATH descriptors via SCM_RIGHTS datagrams

Just need to make sure that AF_UNIX garbage collector won't
confuse O_PATHed socket on filesystem for real AF_UNIX opened
socket.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoreadlinkat(), fchownat() and fstatat() with empty relative pathnames
Al Viro [Sun, 13 Mar 2011 19:56:26 +0000 (15:56 -0400)]
readlinkat(), fchownat() and fstatat() with empty relative pathnames

For readlinkat() we simply allow empty pathname; it will fail unless
we have dfd equal to O_PATH-opened symlink, so we are outside of
POSIX scope here.  For fchownat() and fstatat() we allow AT_EMPTY_PATH;
let the caller explicitly ask for such behaviour.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoAllow O_PATH for symlinks
Al Viro [Sun, 13 Mar 2011 20:42:14 +0000 (16:42 -0400)]
Allow O_PATH for symlinks

At that point we can't do almost nothing with them.  They can be opened
with O_PATH, we can manipulate such descriptors with dup(), etc. and
we can see them in /proc/*/{fd,fdinfo}/*.

We can't (and won't be able to) follow /proc/*/fd/* symlinks for those;
there's simply not enough information for pathname resolution to go on
from such point - to resolve a symlink we need to know which directory
does it live in.

We will be able to do useful things with them after the next commit, though -
readlinkat() and fchownat() will be possible to use with dfd being an
O_PATH-opened symlink and empty relative pathname.  Combined with
open_by_handle() it'll give us a way to do realink-by-handle and
lchown-by-handle without messing with more redundant syscalls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoNew kind of open files - "location only".
Al Viro [Sun, 13 Mar 2011 07:51:11 +0000 (03:51 -0400)]
New kind of open files - "location only".

New flag for open(2) - O_PATH.  Semantics:
* pathname is resolved, but the file itself is _NOT_ opened
as far as filesystem is concerned.
* almost all operations on the resulting descriptors shall
fail with -EBADF.  Exceptions are:
1) operations on descriptors themselves (i.e.
close(), dup(), dup2(), dup3(), fcntl(fd, F_DUPFD),
fcntl(fd, F_DUPFD_CLOEXEC, ...), fcntl(fd, F_GETFD),
fcntl(fd, F_SETFD, ...))
2) fcntl(fd, F_GETFL), for a common non-destructive way to
check if descriptor is open
3) "dfd" arguments of ...at(2) syscalls, i.e. the starting
points of pathname resolution
* closing such descriptor does *NOT* affect dnotify or
posix locks.
* permissions are checked as usual along the way to file;
no permission checks are applied to the file itself.  Of course,
giving such thing to syscall will result in permission checks (at
the moment it means checking that starting point of ....at() is
a directory and caller has exec permissions on it).

fget() and fget_light() return NULL on such descriptors; use of
fget_raw() and fget_raw_light() is needed to get them.  That protects
existing code from dealing with those things.

There are two things still missing (they come in the next commits):
one is handling of symlinks (right now we refuse to open them that
way; see the next commit for semantics related to those) and another
is descriptor passing via SCM_RIGHTS datagrams.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoext4: Copy fs UUID to superblock
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:40 +0000 (18:43 +0530)]
ext4: Copy fs UUID to superblock

File system UUID is made available to application
via  /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoext3: Copy fs UUID to superblock.
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:39 +0000 (18:43 +0530)]
ext3: Copy fs UUID to superblock.

File system UUID is made available to application
via  /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agovfs: Export file system uuid via /proc/<pid>/mountinfo
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:38 +0000 (18:43 +0530)]
vfs: Export file system uuid via /proc/<pid>/mountinfo

We add a per superblock uuid field. File systems should
update the uuid in the fill_super callback

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agounistd.h: Add new syscalls numbers to asm-generic
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:38 +0000 (18:43 +0530)]
unistd.h: Add new syscalls numbers to asm-generic

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agox86: Add new syscalls for x86_64
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:37 +0000 (18:43 +0530)]
x86: Add new syscalls for x86_64

This patch add new syscalls to x86_64

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agox86: Add new syscalls for x86_32
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:35 +0000 (18:43 +0530)]
x86: Add new syscalls for x86_32

This patch adds new syscalls to x86_32

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agofs: Remove i_nlink check from file system link callback
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:30 +0000 (18:43 +0530)]
fs: Remove i_nlink check from file system link callback

Now that VFS check for inode->i_nlink == 0 and returns proper
error, remove similar check from file system

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agofs: Don't allow to create hardlink for deleted file
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:27 +0000 (18:43 +0530)]
fs: Don't allow to create hardlink for deleted file

Add inode->i_nlink == 0 check in VFS. Some of the file systems
do this internally. A followup patch will remove those instance.
This is needed to ensure that with link by handle we don't allow
to create hardlink of an unlinked file. The check also prevent a race
between unlink and link

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agovfs: Add open by file handle support
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:26 +0000 (18:43 +0530)]
vfs: Add open by file handle support

[AV: duplicate of open() guts removed; file_open_root() used instead]

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agovfs: Add name to file handle conversion support
Aneesh Kumar K.V [Sat, 29 Jan 2011 13:13:26 +0000 (18:43 +0530)]
vfs: Add name to file handle conversion support

The syscall also return mount id which can be used
to lookup file system specific information such as uuid
in /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoLinux 2.6.38
Linus Torvalds [Tue, 15 Mar 2011 01:20:32 +0000 (18:20 -0700)]
Linux 2.6.38

13 years agoNew AT_... flag: AT_EMPTY_PATH
Al Viro [Mon, 14 Mar 2011 22:56:51 +0000 (18:56 -0400)]
New AT_... flag: AT_EMPTY_PATH

For name_to_handle_at(2) we'll want both ...at()-style syscall that
would be usable for non-directory descriptors (with empty relative
pathname).  Introduce new flag (AT_EMPTY_PATH) to deal with that and
corresponding LOOKUP_EMPTY; teach user_path_at() and path_init() to
deal with the latter.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
13 years agoMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux...
Linus Torvalds [Mon, 14 Mar 2011 22:20:39 +0000 (15:20 -0700)]
Merge branch 'fixes' of git://git./linux/kernel/git/dhowells/linux-2.6-mn10300

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300:
  MN10300: atomic_read() should ensure it emits a load
  MN10300: The SMP_ICACHE_INV_FLUSH_RANGE IPI command does not exist
  MN10300: Proper use of macros get_user() in the case of incremented pointers

13 years agoMerge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
Linus Torvalds [Mon, 14 Mar 2011 22:20:12 +0000 (15:20 -0700)]
Merge branch 'upstream' of git://git.linux-mips.org/upstream-linus

* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (26 commits)
  MIPS: Alchemy: Fix reset for MTX-1 and XXS1500
  MIPS: MTX-1: Make au1000_eth probe all PHY addresses
  MIPS: Jz4740: Add HAVE_CLK
  MIPS: Move idle task creation to work queue
  MIPS, Perf-events: Use unsigned delta for right shift in event update
  MIPS, Perf-events: Work with the new callchain interface
  MIPS, Perf-events: Fix event check in validate_event()
  MIPS, Perf-events: Work with the new PMU interface
  MIPS, Perf-events: Work with irq_work
  MIPS: Fix always CONFIG_LOONGSON_UART_BASE=y
  MIPS: Loongson: Fix potentially wrong string handling
  MIPS: Fix GCC-4.6 'set but not used' warning in arch/mips/mm/init.c
  MIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.h
  MIPS: Remove unused code from arch/mips/kernel/syscall.c
  MIPS: Fix GCC-4.6 'set but not used' warning in signal*.c
  MIPS: MSP: Fix MSP71xx bpci interrupt handler return value
  MIPS: Select R4K timer lib for all MSP platforms
  MIPS: Loongson: Remove ad-hoc cmdline default
  MIPS: Clear the correct flag in sysmips(MIPS_FIXADE, ...).
  MIPS: Add an unreachable return statement to satisfy buggy GCCs.
  ...

13 years agoMerge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Mon, 14 Mar 2011 22:19:09 +0000 (15:19 -0700)]
Merge branch 'x86-fixes-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: ce4100: Set pci ops via callback instead of module init
  x86/mm: Fix pgd_lock deadlock
  x86/mm: Handle mm_fault_error() in kernel space
  x86: Don't check for BIOS corruption in first 64K when there's no need to

13 years agoRevert "oom: oom_kill_process: fix the child_points logic"
Linus Torvalds [Mon, 14 Mar 2011 22:17:07 +0000 (15:17 -0700)]
Revert "oom: oom_kill_process: fix the child_points logic"

This reverts the parent commit.  I hate doing that, but it's generating
some discussion ("half of it is right"), and since I am planning on
doing the 2.6.38 release later today we can punt it to stable if
required. Let's not rock the boat right now.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agooom: oom_kill_process: fix the child_points logic
Oleg Nesterov [Mon, 14 Mar 2011 19:05:30 +0000 (20:05 +0100)]
oom: oom_kill_process: fix the child_points logic

oom_kill_process() starts with victim_points == 0.  This means that
(most likely) any child has more points and can be killed erroneously.

Also, "children has a different mm" doesn't match the reality, we should
check child->mm != t->mm.  This check is not exactly correct if t->mm ==
NULL but this doesn't really matter, oom_kill_task() will kill them
anyway.

Note: "Kill all processes sharing p->mm" in oom_kill_task() is wrong
too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agoarm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()
Thomas Gleixner [Mon, 14 Mar 2011 19:00:30 +0000 (20:00 +0100)]
arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()

commit 522d7dec(futex: Remove redundant pagefault_disable in
futex_atomic_cmpxchg_inatomic()) added a bogus comment.

/* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic
 * call sites. */

Bogus in two aspects:

1) pagefault_disable != preempt_disable even if the mechanism we use
   is the same

2) we have a call site which deliberately does not disable pagefaults
   as it wants the possible fault to be handled - though that has been
   changed for consistency reasons now.

Sigh. I really should have seen that when committing the above. :(

Catched-by-and-rightfully-ranted-at-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <alpine.LFD.2.00.1103141126590.2787@localhost6.localdomain6>
Cc: Michel Lespinasse <walken@google.com>
Cc: Darren Hart <darren@dvhart.com>
13 years agofutex: Deobfuscate handle_futex_death()
Thomas Gleixner [Mon, 14 Mar 2011 09:34:35 +0000 (10:34 +0100)]
futex: Deobfuscate handle_futex_death()

handle_futex_death() uses futex_atomic_cmpxchg_inatomic() without
disabling page faults. That's ok, but totally non obvious.

We don't hold locks so we actually can and want to fault here, because
the get_user() before futex_atomic_cmpxchg_inatomic() does not
guarantee a R/W mapping.

We could just add a big fat comment to explain this, but actually
changing the code so that the functionality is entirely clear is
better.

Use the helper function which disables page faults around the
futex_atomic_cmpxchg_inatomic() and handle a fault with a call to
fault_in_user_writeable() as all other places in the futex code do as
well.

Pointed-out-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Darren Hart <darren@dvhart.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
LKML-Reference: <alpine.LFD.2.00.1103141126590.2787@localhost6.localdomain6>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
13 years agoMIPS: Alchemy: Fix reset for MTX-1 and XXS1500
Florian Fainelli [Mon, 21 Feb 2011 13:28:02 +0000 (14:28 +0100)]
MIPS: Alchemy: Fix reset for MTX-1 and XXS1500

Since commit 32fd6901 (MIPS: Alchemy: get rid of common/reset.c)
Alchemy-based boards use their own reset function. For MTX-1 and XXS1500,
the reset function pokes at the BCSR.SYSTEM_RESET register, but this does
not work. According to Bruno Randolf, this was not tested when written.

Previously, the generic au1000_restart() routine called the board specific
reset function, which for MTX-1 and XXS1500 did not work, but finally made
a jump to the reset vector, which really triggers a system restart. Fix
reboot for both targets by jumping to the reset vector.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2093/
Acked-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: MTX-1: Make au1000_eth probe all PHY addresses
Florian Fainelli [Sun, 27 Feb 2011 18:53:53 +0000 (19:53 +0100)]
MIPS: MTX-1: Make au1000_eth probe all PHY addresses

When au1000_eth probes the MII bus for PHY address, if we do not set
au1000_eth platform data's phy_search_highest_address, the MII probing
logic will exit early and will assume a valid PHY is found at address 0.
For MTX-1, the PHY is at address 31, and without this patch, the link
detection/speed/duplex would not work correctly.

CC: stable@kernel.org
Signed-off-by: Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2111/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Jz4740: Add HAVE_CLK
Maurus Cuelenaere [Mon, 28 Feb 2011 23:20:01 +0000 (00:20 +0100)]
MIPS: Jz4740: Add HAVE_CLK

Jz4740 supports the clock framework but doesn't have HAVE_CLK defined,
so define it!

Signed-off-by: Maurus Cuelenaere <mcuelenaere@gmail.com>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2112/
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Move idle task creation to work queue
Maksim Rayskiy [Sat, 12 Feb 2011 18:21:32 +0000 (10:21 -0800)]
MIPS: Move idle task creation to work queue

To avoid forking usermode thread when creating an idle task, move fork_idle
to a work queue.

If kernel starts with maxcpus= option which does not bring all available
cpus online at boot time, idle tasks for offline cpus are not created. If
later offline cpus are hotplugged through sysfs, __cpu_up is called in
the context of the user task, and fork_idle copies its non-zero mm
pointer.  This causes BUG() in per_cpu_trap_init.

This also avoids issues with resource limits of the CPU writing to sysfs,
containers, maybe others.

Signed-off-by: Maksim Rayskiy <mrayskiy@broadcom.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2070/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Perf-events: Use unsigned delta for right shift in event update
Deng-Cheng Zhu [Fri, 21 Jan 2011 08:19:21 +0000 (16:19 +0800)]
MIPS, Perf-events: Use unsigned delta for right shift in event update

Leverage the commit for ARM by Will Deacon:

446a5a8b1eb91a6990e5c8fe29f14e7a95b69132
    ARM: 6205/1: perf: ensure counter delta is treated as unsigned

    Hardware performance counters on ARM are 32-bits wide but atomic64_t
    variables are used to represent counter data in the hw_perf_event structure.

    The armpmu_event_update function right-shifts a signed 64-bit delta variable
    and adds the result to the event count. This can lead to shifting in sign-bits
    if the MSB of the 32-bit counter value is set. This results in perf output
    such as:

     Performance counter stats for 'sleep 20':

     18446744073460670464  cycles             <-- 0xFFFFFFFFF12A6000
            7783773  instructions             #      0.000 IPC
                465  context-switches
                161  page-faults
            1172393  branches

       20.154242147  seconds time elapsed

    This patch ensures that the delta value is treated as unsigned so that the
    right shift sets the upper bits to zero.

Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: a.p.zijlstra@chello.nl
To: fweisbec@gmail.com
To: will.deacon@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: wuzhangjin@gmail.com
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: matt@console-pimps.org
Cc: sshtylyov@mvista.com
Patchwork: http://patchwork.linux-mips.org/patch/2015/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Perf-events: Work with the new callchain interface
Deng-Cheng Zhu [Fri, 21 Jan 2011 08:19:20 +0000 (16:19 +0800)]
MIPS, Perf-events: Work with the new callchain interface

This is the MIPS part of the following commits by Frederic Weisbecker:

f72c1a931e311bb7780fee19e41a89ac42cab50e
    perf: Factorize callchain context handling

    Store the kernel and user contexts from the generic layer instead
    of archs, this gathers some repetitive code.

56962b4449af34070bb1994621ef4f0265eed4d8
    perf: Generalize some arch callchain code

    - Most archs use one callchain buffer per cpu, except x86 that needs
      to deal with NMIs. Provide a default perf_callchain_buffer()
      implementation that x86 overrides.

    - Centralize all the kernel/user regs handling and invoke new arch
      handlers from there: perf_callchain_user() / perf_callchain_kernel()
      That avoid all the user_mode(), current->mm checks and so...

    - Invert some parameters in perf_callchain_*() helpers: entry to the
      left, regs to the right, following the traditional (dst, src).

70791ce9ba68a5921c9905ef05d23f62a90bc10c
    perf: Generalize callchain_store()

    callchain_store() is the same on every archs, inline it in
    perf_event.h and rename it to perf_callchain_store() to avoid
    any collision.

    This removes repetitive code.

c1a65932fd7216fdc9a0db8bbffe1d47842f862c
    perf: Drop unappropriate tests on arch callchains

    Drop the TASK_RUNNING test on user tasks for callchains as
    this check doesn't seem to make any sense.

    Also remove the tests for !current that is not supposed to
    happen and current->pid as this should be handled at the
    generic level, with exclude_idle attribute.

Reported-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: a.p.zijlstra@chello.nl
To: will.deacon@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: dengcheng.zhu@gmail.com
Cc: matt@console-pimps.org
Cc: sshtylyov@mvista.com
Patchwork: http://patchwork.linux-mips.org/patch/2014/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Perf-events: Fix event check in validate_event()
Deng-Cheng Zhu [Fri, 21 Jan 2011 08:19:19 +0000 (16:19 +0800)]
MIPS, Perf-events: Fix event check in validate_event()

Ignore events that are in off/error state or belong to a different PMU.

This patch originates from the following commit for ARM by Will Deacon:

65b4711ff513767341aa1915c822de6ec0de65cb
    ARM: 6352/1: perf: fix event validation

    The validate_event function in the ARM perf events backend has the
    following problems:

    1.) Events that are disabled count towards the cost.
    2.) Events associated with other PMUs [for example, software events or
        breakpoints] do not count towards the cost, but do fail validation,
        causing the group to fail.

    This patch changes validate_event so that it ignores events in the
    PERF_EVENT_STATE_OFF state or that are scheduled for other PMUs.

Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: a.p.zijlstra@chello.nl
To: fweisbec@gmail.com
To: will.deacon@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: wuzhangjin@gmail.com
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: dengcheng.zhu@gmail.com
Cc: matt@console-pimps.org
Cc: sshtylyov@mvista.com
Cc: ddaney@caviumnetworks.com
Patchwork: http://patchwork.linux-mips.org/patch/2013/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Perf-events: Work with the new PMU interface
Deng-Cheng Zhu [Fri, 21 Jan 2011 08:19:18 +0000 (16:19 +0800)]
MIPS, Perf-events: Work with the new PMU interface

This is the MIPS part of the following commits by Peter Zijlstra:

a4eaf7f14675cb512d69f0c928055e73d0c6d252
    perf: Rework the PMU methods

    Replace pmu::{enable,disable,start,stop,unthrottle} with
    pmu::{add,del,start,stop}, all of which take a flags argument.

    The new interface extends the capability to stop a counter while
    keeping it scheduled on the PMU. We replace the throttled state with
    the generic stopped state.

    This also allows us to efficiently stop/start counters over certain
    code paths (like IRQ handlers).

    It also allows scheduling a counter without it starting, allowing for
    a generic frozen state (useful for rotating stopped counters).

    The stopped state is implemented in two different ways, depending on
    how the architecture implemented the throttled state:

     1) We disable the counter:
        a) the pmu has per-counter enable bits, we flip that
        b) we program a NOP event, preserving the counter state

     2) We store the counter state and ignore all read/overflow events

For MIPSXX, the stopped state is implemented in the way of 1.b as above.

33696fc0d141bbbcb12f75b69608ea83282e3117
    perf: Per PMU disable

    Changes perf_disable() into perf_pmu_disable().

24cd7f54a0d47e1d5b3de29e2456bfbd2d8447b7
    perf: Reduce perf_disable() usage

    Since the current perf_disable() usage is only an optimization,
    remove it for now. This eases the removal of the __weak
    hw_perf_enable() interface.

b0a873ebbf87bf38bf70b5e39a7cadc96099fa13
    perf: Register PMU implementations

    Simple registration interface for struct pmu, this provides the
    infrastructure for removing all the weak functions.

51b0fe39549a04858001922919ab355dee9bdfcf
    perf: Deconstify struct pmu

    sed -ie 's/const struct pmu\>/struct pmu/g' `git grep -l "const struct pmu\>"`

Reported-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: a.p.zijlstra@chello.nl
To: fweisbec@gmail.com
To: will.deacon@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: wuzhangjin@gmail.com
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: dengcheng.zhu@gmail.com
Cc: matt@console-pimps.org
Cc: sshtylyov@mvista.com
Cc: ddaney@caviumnetworks.com
Patchwork: http://patchwork.linux-mips.org/patch/2012/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Perf-events: Work with irq_work
Deng-Cheng Zhu [Fri, 21 Jan 2011 08:19:17 +0000 (16:19 +0800)]
MIPS, Perf-events: Work with irq_work

This is the MIPS part of the following commit by Peter Zijlstra:

e360adbe29241a0194e10e20595360dd7b98a2b3
    irq_work: Add generic hardirq context callbacks

    Provide a mechanism that allows running code in IRQ context. It is
    most useful for NMI code that needs to interact with the rest of the
    system -- like wakeup a task to drain buffers.

    Perf currently has such a mechanism, so extract that and provide it as
    a generic feature, independent of perf so that others may also
    benefit.

    The IRQ context callback is generated through self-IPIs where
    possible, or on architectures like powerpc the decrementer (the
    built-in timer facility) is set to generate an interrupt immediately.

    Architectures that don't have anything like this get to do with a
    callback from the timer tick. These architectures can call
    irq_work_run() at the tail of any IRQ handlers that might enqueue such
    work (like the perf IRQ handler) to avoid undue latencies in
    processing the work.

For MIPSXX, we need to call irq_work_run() at the tail of the perf IRQ
handler as described above.

Reported-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: fweisbec@gmail.com
To: will.deacon@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: matt@console-pimps.org
Cc: sshtylyov@mvista.com,
Patchwork: http://patchwork.linux-mips.org/patch/2011/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Fix always CONFIG_LOONGSON_UART_BASE=y
Yoichi Yuasa [Mon, 7 Feb 2011 02:31:36 +0000 (11:31 +0900)]
MIPS: Fix always CONFIG_LOONGSON_UART_BASE=y

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
Cc: linux-mips <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2055/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Loongson: Fix potentially wrong string handling
Stefan Weil [Sun, 30 Jan 2011 20:41:44 +0000 (21:41 +0100)]
MIPS: Loongson: Fix potentially wrong string handling

This error was reported by cppcheck:
arch/mips/loongson/common/machtype.c:56: error: Dangerous usage of 'str' (strncpy doesn't always 0-terminate it)

If strncpy copied MACHTYPE_LEN bytes, the destination string str
was not terminated.

The patch adds one more byte to str and makes sure that this byte is
always 0.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Arnaud Patard <apatard@mandriva.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2053/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Fix GCC-4.6 'set but not used' warning in arch/mips/mm/init.c
David Daney [Mon, 24 Jan 2011 22:51:37 +0000 (14:51 -0800)]
MIPS: Fix GCC-4.6 'set but not used' warning in arch/mips/mm/init.c

Under some combinations of CONFIG_*, lastpfn in page_is_ram is 'set
but not used'.  Mark it as __maybe_unused to quiet the warning/error.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2033/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.h
David Daney [Mon, 24 Jan 2011 22:51:36 +0000 (14:51 -0800)]
MIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.h

GCC-4.6 can find more unused code than previous versions could.

In the case of arch/mips/math-emu/ieee754int.h, the COMPXSP and
COMPXDP macros are used in several places, but a couple of them leave
xs unused.  The easiest thing to do is mark it as __maybe_unused to
quiet the warning.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2032/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Remove unused code from arch/mips/kernel/syscall.c
David Daney [Mon, 24 Jan 2011 22:51:35 +0000 (14:51 -0800)]
MIPS: Remove unused code from arch/mips/kernel/syscall.c

The variable arg3 in _sys_sysmips() is unused.  Remove it.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2034/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Fix GCC-4.6 'set but not used' warning in signal*.c
David Daney [Mon, 24 Jan 2011 22:51:34 +0000 (14:51 -0800)]
MIPS: Fix GCC-4.6 'set but not used' warning in signal*.c

GCC-4.6 can find more unused code than previous versions could.

In the case of protected_restore_fp_context{,32}, the variable tmp is
really used.  Its use is tricky in that we really care about the side
effects of the __put_user() calls.  So we must mark tmp with
__maybe_unused to quiet the warning.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2035/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: MSP: Fix MSP71xx bpci interrupt handler return value
Anoop P A [Thu, 18 Nov 2010 10:32:50 +0000 (16:02 +0530)]
MIPS: MSP: Fix MSP71xx bpci interrupt handler return value

Signed-off-by: Anoop P A <anoop.pa@gmail.com>
To: Ben Hutchings <ben@decadent.org.uk>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1804/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Select R4K timer lib for all MSP platforms
Anoop P A [Thu, 18 Nov 2010 08:12:28 +0000 (13:42 +0530)]
MIPS: Select R4K timer lib for all MSP platforms

Signed-off-by: Anoop P A <anoop.pa@gmail.com>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1803/
Tested-by: Shane McDonald <mcdonald.shane@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Loongson: Remove ad-hoc cmdline default
Robert Millan [Sun, 7 Nov 2010 12:38:29 +0000 (13:38 +0100)]
MIPS: Loongson: Remove ad-hoc cmdline default

Loongson builds have an ad-hoc cmdline default of "console=ttyS0,115200
root=/dev/hda1". These settings come from a vendor; I remember builds
from Lemote branch requiring a "console=tty" override in order to get a
working console.

At least on Yeeloong, they're particularly useless: there's no external
serial port, and the IDE drive is now recognised as /dev/sda.

Signed-off-by: Robert Millan <rmh@gnu.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1759/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Clear the correct flag in sysmips(MIPS_FIXADE, ...).
Stefan Oberhumer [Mon, 17 Jan 2011 08:19:53 +0000 (09:19 +0100)]
MIPS: Clear the correct flag in sysmips(MIPS_FIXADE, ...).

The sysmips(MIPS_FIXADE, ...) case contains an obvious copy-and-paste
error in the handling of the TIF_LOGADE flag. Fix that

Patchwork: https://patchwork.linux-mips.org/patch/1997/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS: Add an unreachable return statement to satisfy buggy GCCs.
David Daney [Wed, 19 Jan 2011 23:24:42 +0000 (15:24 -0800)]
MIPS: Add an unreachable return statement to satisfy buggy GCCs.

It was reported that GCC-4.3.3 (with CodeSourcery extensions) fails
without this.

Reported-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2010/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 years agoMIPS, Tracing: Fix set_graph_function of function graph tracer
Wu Zhangjin [Fri, 21 Jan 2011 18:01:53 +0000 (02:01 +0800)]
MIPS, Tracing: Fix set_graph_function of function graph tracer

trace.func should be set to the recorded ip of the mcount calling site
in the __mcount_loc section to filter the function entries configured
through the tracing/set_graph_function interface, but before, this is
set to the self_ra(the return address of mcount), which has made
set_graph_function not work as expected.

This fixes it via calculating the right recorded ip in the __mcount_loc
section and assign it to trace.func.

Reported-by: Zhiping Zhong <xzhong86@163.com>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2017/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoMIPS, Tracing: Clean up ftrace_make_nop()
Wu Zhangjin [Wed, 19 Jan 2011 19:28:31 +0000 (03:28 +0800)]
MIPS, Tracing: Clean up ftrace_make_nop()

This moves the comments out of ftrace_make_nop() and cleans it.  At the
same time, a macro MCOUNT_OFFSET_INSNS is defined for sharing with the
next patch.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2008/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoMIPS, Tracing: Clean up prepare_ftrace_return()
Wu Zhangjin [Wed, 19 Jan 2011 19:28:30 +0000 (03:28 +0800)]
MIPS, Tracing: Clean up prepare_ftrace_return()

The old prepare_ftrace_return() for MIPS is confused and have introduced
some problem. This patch cleans up the names of the arguments, variables
and related functions.

For MIPS, the 2nd argument of prepare_ftrace_return() is not really the
'selfpc' described in ftrace-design.txt but instead it is the self
return address. This did break the compatibility of the generic
interface but really reduced one unneeded calculation for to get the
current function name, the parent return address and the self return
address are enough, no need to tranform the self return address to the
self address.

But set_graph_function of function graph tracer is an exception, it does
need the 2nd argument of prepare_ftrace_return() as 'selfpc', for it
will use 'selfpc' to match user's configuration of function graph
entries, but in reality, it doesn't need the 'selfpc' but the recorded
ip address of the mcount calling site in the __mcount_loc section. So,
the 2nd argument of prepare_ftrace_return() is not important, the real
requirement is the right recorded ip address should be calculated and
assign to trace.func, this will be fixed in the next patches.

Reported-by: Zhiping Zhong <xzhong86@163.com>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2007/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoMIPS, Tracing: Substitute in_kernel_space() for in_module()
Wu Zhangjin [Wed, 19 Jan 2011 19:28:29 +0000 (03:28 +0800)]
MIPS, Tracing: Substitute in_kernel_space() for in_module()

The old in_module() may not work in some situations(e.g. when module &
kernel are in the same address space when CONFIG_MAPPED_KERNEL=y), The
in_kernel_space() is more generic and it is also easy to be implemented
via cloning the existing core_kernel_text(), so, replace the in_module()
with in_kernel_space().

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2005/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoMIPS, Tracing: Speed up function graph tracer
Wu Zhangjin [Wed, 19 Jan 2011 19:28:27 +0000 (03:28 +0800)]
MIPS, Tracing: Speed up function graph tracer

This simply moves the "ip-=4" statement down to the end of the do { ...
} while (...); loop, which reduces one unneeded subtration and the
subsequent memory loading and comparison.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2006/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoMIPS: Replace deprecated spinlock initialization
Thomas Gleixner [Sun, 23 Jan 2011 15:17:00 +0000 (15:17 +0000)]
MIPS: Replace deprecated spinlock initialization

SPIN_LOCK_UNLOCK is deprecated. Use the lockdep capable variant instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2025/
Signed-off-by: Ralf Baechle <ralf@duck.linux-mips.net>
13 years agoperf script: Add support for H/W and S/W events
David Ahern [Thu, 10 Mar 2011 05:23:28 +0000 (22:23 -0700)]
perf script: Add support for H/W and S/W events

Custom fields set for each type by prepending field argument with type.
For file with multiple event types (e.g., trace and S/W) display of an
event type suppressed by setting output fields to "".

e.g.,
perf record -ga -e sched:sched_switch -e cpu-clock -c 10000000 -R -- sleep 1
perf script

openssl 11496 [000]  9711.807107: cpu-clock-msecs:
        ffffffff810c22dc arch_local_irq_restore ([kernel.kallsyms])
        ffffffff810c518c __alloc_pages_nodemask ([kernel.kallsyms])
        ffffffff810297b2 pte_alloc_one ([kernel.kallsyms])
        ffffffff810d8b98 __pte_alloc ([kernel.kallsyms])
        ffffffff810daf07 handle_mm_fault ([kernel.kallsyms])
        ffffffff8138763a do_page_fault ([kernel.kallsyms])
        ffffffff81384a65 page_fault ([kernel.kallsyms])
            7f6130507d70 asn1_check_tlen (/lib64/libcrypto.so.1.0.0c)
                       0  ()

         openssl 11496 [000]  9711.808042: sched_switch: prev_comm=openssl ...
     kworker/0:0     4 [000]  9711.808067: sched_switch: prev_comm=kworker/...
         swapper     0 [001]  9711.808090: sched_switch: prev_comm=kworker/...
            sshd 11451 [001]  9711.808185: sched_switch: prev_comm=sshd pre...
swapper     0 [001]  9711.816155: cpu-clock-msecs:
        ffffffff81023609 native_safe_halt ([kernel.kallsyms])
        ffffffff8100132a cpu_idle ([kernel.kallsyms])
        ffffffff8137cf9b start_secondary ([kernel.kallsyms])

openssl 11496 [000]  9711.817104: cpu-clock-msecs:
            7f61304ad723 AES_cbc_encrypt (/lib64/libcrypto.so.1.0.0c)
            7fff3402f950  ()
        12f0debc9a785634  ()

swapper     0 [001]  9711.826155: cpu-clock-msecs:
        ffffffff81023609 native_safe_halt ([kernel.kallsyms])
        ffffffff8100132a cpu_idle ([kernel.kallsyms])
        ffffffff8137cf9b start_secondary ([kernel.kallsyms])

To suppress trace events within the file and use default output for S/W events:
perf script -f trace:

or to suppress S/W events and do default display for trace events:
perf script -f sw:

Custom field selections:
perf script -f sw:comm,tid,time -f trace:time,trace

         openssl 11496  9711.797162:
         swapper     0  9711.807071:
         openssl 11496  9711.807107:
 9711.808042: prev_comm=openssl prev_pid=11496 prev_prio=120 prev_state=R ...
 9711.808067: prev_comm=kworker/0:0 prev_pid=4 prev_prio=120 prev_state=S ...
 9711.808090: prev_comm=kworker/0:0 prev_pid=0 prev_prio=120 prev_state=R ...
 9711.808185: prev_comm=sshd prev_pid=11451 prev_prio=120 prev_state=S ==>...
         swapper     0  9711.816155:
         openssl 11496  9711.817104:
         swapper     0  9711.826155:

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-7-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoperf script: Add support for dumping symbols
David Ahern [Thu, 10 Mar 2011 05:23:27 +0000 (22:23 -0700)]
perf script: Add support for dumping symbols

Add option to dump symbols found in events.

e.g., perf script -f comm,pid,tid,time,trace,sym

swapper     0/0       537.037184: prev_comm=swapper prev_pid=0 prev_prio=120...
        ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
        ffffffff81382ac5 schedule ([kernel.kallsyms])
        ffffffff8100134a cpu_idle ([kernel.kallsyms])
        ffffffff81370b39 rest_init ([kernel.kallsyms])
        ffffffff81696c23 start_kernel ([kernel.kallsyms].init.text)
        ffffffff816962af x86_64_start_reservations ([kernel.kallsyms].init.text)
        ffffffff816963b9 x86_64_start_kernel ([kernel.kallsyms].init.text)

sshd  1675/1675    537.037309: prev_comm=sshd prev_pid=1675 prev_prio=120...
        ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
        ffffffff81382ac5 schedule ([kernel.kallsyms])
        ffffffff813837aa schedule_hrtimeout_range_clock ([kernel.kallsyms])
        ffffffff81383886 schedule_hrtimeout_range ([kernel.kallsyms])
        ffffffff8110c4f9 poll_schedule_timeout ([kernel.kallsyms])
        ffffffff8110cd20 do_select ([kernel.kallsyms])
        ffffffff8110ced8 core_sys_select ([kernel.kallsyms])
        ffffffff8110d00d sys_select ([kernel.kallsyms])
        ffffffff81002bc2 system_call ([kernel.kallsyms])
            7f1647e56e93 __GI_select (/lib64/libc-2.12.90.so)

netstat  1692/1692    537.038664: prev_comm=netstat prev_pid=1692 prev_prio=...
        ffffffff81030350 perf_trace_sched_switch ([kernel.kallsyms])
        ffffffff81382ac5 schedule ([kernel.kallsyms])
        ffffffff81002c3a sysret_careful ([kernel.kallsyms])
            7f7a6cd1b210 __GI___libc_read (/lib64/libc-2.12.90.so)

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-6-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoperf script: Support custom field selection for output
David Ahern [Thu, 10 Mar 2011 05:23:26 +0000 (22:23 -0700)]
perf script: Support custom field selection for output

Allow a user to select which fields to print to stdout for event data.
Options include comm (command name), tid (thread id), pid (process id),
time (perf timestamp), cpu, event (for event name), and trace (for
trace data).

Default is set to maintain compatibility with current output; this
feature does alter output format slightly -- no '-' between command
and pid/tid.

Thanks to Frederic Weisbecker for detailed suggestions on this approach.

Examples (output compressed)

1. trace, default format

perf record -ga -e sched:sched_switch
perf script

swapper    0 [000] 537.037184: sched_switch: prev_comm=swapper prev_pid=0...
   sshd 1675 [000] 537.037309: sched_switch: prev_comm=sshd prev_pid=1675...
netstat 1692 [001] 537.038664: sched_switch: prev_comm=netstat prev_pid=1692...

2. trace, custom format

perf record -ga -e sched:sched_switch
perf script -f comm,pid,time,trace     <--- omitting cpu and event name

swapper    0 537.037184: prev_comm=swapper prev_pid=0 prev_prio=120 ...
   sshd 1675 537.037309: prev_comm=sshd prev_pid=1675 prev_prio=120 ...
netstat 1692 537.038664: prev_comm=netstat prev_pid=1692 prev_prio=120 ...

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-5-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoperf script: Move printing of 'common' data from print_event and rename
David Ahern [Thu, 10 Mar 2011 05:23:25 +0000 (22:23 -0700)]
perf script: Move printing of 'common' data from print_event and rename

This change does impact output: latency data is trace specific and is
now printed after the common data - comm, tid, cpu, time and event name.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-4-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoperf tracing: Remove print_graph_cpu and print_graph_proc from trace-event-parse
David Ahern [Thu, 10 Mar 2011 05:23:24 +0000 (22:23 -0700)]
perf tracing: Remove print_graph_cpu and print_graph_proc from trace-event-parse

Next patch moves printing of 'common' data into perf-script which
removes the need for these functions.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-3-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoperf script: Change process_event prototype
David Ahern [Thu, 10 Mar 2011 05:23:23 +0000 (22:23 -0700)]
perf script: Change process_event prototype

Prepare for handling of samples for any event type.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1299734608-5223-2-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agoMerge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
Linus Torvalds [Mon, 14 Mar 2011 18:19:50 +0000 (11:19 -0700)]
Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: NFSROOT should default to "proto=udp"
  nfs4: remove duplicated #include
  NFSv4: nfs4_state_mark_reclaim_nograce() should be static
  NFSv4: Fix the setlk error handler
  NFSv4.1: Fix the handling of the SEQUENCE status bits
  NFSv4/4.1: Fix nfs4_schedule_state_recovery abuses
  NFSv4.1 reclaim complete must wait for completion
  NFSv4: remove duplicate clientid in struct nfs_client
  NFSv4.1: Retry CREATE_SESSION on NFS4ERR_DELAY
  sunrpc: Propagate errors from xs_bind() through xs_create_sock()
  (try3-resend) Fix nfs_compat_user_ino64 so it doesn't cause problems if bit 31 or 63 are set in fileid
  nfs: fix compilation warning
  nfs: add kmalloc return value check in decode_and_add_ds
  SUNRPC: Remove resource leak in svc_rdma_send_error()
  nfs: close NFSv4 COMMIT vs. CLOSE race
  SUNRPC: Close a race in __rpc_wait_for_completion_task()

13 years agoMerge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
Linus Torvalds [Mon, 14 Mar 2011 18:17:43 +0000 (11:17 -0700)]
Merge branch 'drm-fixes' of git://git./linux/kernel/git/airlied/drm-2.6

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/radeon: fix problem with changing active VRAM size. (v2)

13 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
Linus Torvalds [Mon, 14 Mar 2011 17:15:43 +0000 (10:15 -0700)]
Merge git://git./linux/kernel/git/wim/linux-2.6-watchdog

* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  watchdog: hpwdt: eliminate section mismatch warning
  watchdog: w83697ug_wdt: Fix set bit 0 to activate GPIO2
  watchdog: sch311x_wdt: fix printk condition
  watchdog: sch311x_wdt: Fix LDN active check
  watchdog: cpwd: Fix buffer-overflow

13 years agoFix corrupted OSF partition table parsing
Timo Warns [Mon, 14 Mar 2011 13:59:33 +0000 (14:59 +0100)]
Fix corrupted OSF partition table parsing

The kernel automatically evaluates partition tables of storage devices.
The code for evaluating OSF partitions contains a bug that leaks data
from kernel heap memory to userspace for certain corrupted OSF
partitions.

In more detail:

  for (i = 0 ; i < le16_to_cpu(label->d_npartitions); i++, partition++) {

iterates from 0 to d_npartitions - 1, where d_npartitions is read from
the partition table without validation and partition is a pointer to an
array of at most 8 d_partitions.

Add the proper and obvious validation.

Signed-off-by: Timo Warns <warns@pre-sense.de>
Cc: stable@kernel.org
[ Changed the patch trivially to not repeat the whole le16_to_cpu()
  thing, and to use an explicit constant for the magic value '8' ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 years agoperf stat: Provide support for filters
Frederic Weisbecker [Mon, 14 Mar 2011 15:40:30 +0000 (16:40 +0100)]
perf stat: Provide support for filters

Now the --filter option is usable with perf stat too.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <1300117230-8404-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
13 years agothp+memcg-numa: fix BUG at include/linux/mm.h:370!
Hugh Dickins [Mon, 14 Mar 2011 08:08:47 +0000 (01:08 -0700)]
thp+memcg-numa: fix BUG at include/linux/mm.h:370!

THP's collapse_huge_page() has an understandable but ugly difference
in when its huge page is allocated: inside if NUMA but outside if not.
It's hardly surprising that the memcg failure path forgot that, freeing
the page in the non-NUMA case, then hitting a VM_BUG_ON in get_page()
(or even worse, using the freed page).

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>