Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / Kconfig

diff --git a/arch/Kconfig b/arch/Kconfig
index 3301768245941e06d8b5e2574896d04f87cff802..7f8f281f2585e25ee74853bfb88183514ce3d5ca 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -80,6 +80,7 @@ config UPROBES
        bool "Transparent user-space probes (EXPERIMENTAL)"
        depends on UPROBE_EVENT && PERF_EVENTS
        default n
+       select PERCPU_RWSEM
        help
          Uprobes is the user-space counterpart to kprobes: they
          enable instrumentation applications (such as 'perf probe')
@@ -112,6 +113,25 @@ config HAVE_EFFICIENT_UNALIGNED_ACCESS
          See Documentation/unaligned-memory-access.txt for more
          information on the topic of unaligned memory accesses.
 
+config ARCH_USE_BUILTIN_BSWAP
+       bool
+       help
+        Modern versions of GCC (since 4.4) have builtin functions
+        for handling byte-swapping. Using these, instead of the old
+        inline assembler that the architecture code provides in the
+        __arch_bswapXX() macros, allows the compiler to see what's
+        happening and offers more opportunity for optimisation. In
+        particular, the compiler will be able to combine the byteswap
+        with a nearby load or store and use load-and-swap or
+        store-and-swap instructions if the architecture has them. It
+        should almost *never* result in code which is worse than the
+        hand-coded assembler in <asm/swab.h>.  But just in case it
+        does, the use of the builtins is optional.
+
+        Any architecture with load-and-swap or store-and-swap
+        instructions should set this. And it shouldn't hurt to set it
+        on architectures that don't have such instructions.
+
 config HAVE_SYSCALL_WRAPPERS
        bool
 
@@ -294,15 +314,16 @@ config SECCOMP_FILTER
 
          See Documentation/prctl/seccomp_filter.txt for details.
 
-config HAVE_RCU_USER_QS
+config HAVE_CONTEXT_TRACKING
        bool
        help
-         Provide kernel entry/exit hooks necessary for userspace
-         RCU extended quiescent state. Syscalls need to be wrapped inside
-         rcu_user_exit()-rcu_user_enter() through the slow path using
-         TIF_NOHZ flag. Exceptions handlers must be wrapped as well. Irqs
-         are already protected inside rcu_irq_enter/rcu_irq_exit() but
-         preemption or signal handling on irq exit still need to be protected.
+         Provide kernel/user boundaries probes necessary for subsystems
+         that need it, such as userspace RCU extended quiescent state.
+         Syscalls need to be wrapped inside user_exit()-user_enter() through
+         the slow path using TIF_NOHZ flag. Exceptions handlers must be
+         wrapped as well. Irqs are already protected inside
+         rcu_irq_enter/rcu_irq_exit() but preemption or signal handling on
+         irq exit still need to be protected.
 
 config HAVE_VIRT_CPU_ACCOUNTING
        bool