From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 1 Oct 2012 18:10:52 +0000 (-0700)
Subject: Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git... 
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ac07f5c3cb0cf19258c55cdf210aa4ac91ca7330;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

Merge branch 'x86-fpu-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86/fpu update from Ingo Molnar:
 "The biggest change is the addition of the non-lazy (eager) FPU saving
  support model and enabling it on CPUs with optimized xsaveopt/xrstor
  FPU state saving instructions.

  There are also various Sparse fixes"

Fix up trivial add-add conflict in arch/x86/kernel/traps.c

* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, kvm: fix kvm's usage of kernel_fpu_begin/end()
  x86, fpu: remove cpu_has_xmm check in the fx_finit()
  x86, fpu: make eagerfpu= boot param tri-state
  x86, fpu: enable eagerfpu by default for xsaveopt
  x86, fpu: decouple non-lazy/eager fpu restore from xsave
  x86, fpu: use non-lazy fpu restore for processors supporting xsave
  lguest, x86: handle guest TS bit for lazy/non-lazy fpu host models
  x86, fpu: always use kernel_fpu_begin/end() for in-kernel FPU usage
  x86, kvm: use kernel_fpu_begin/end() in kvm_load/put_guest_fpu()
  x86, fpu: remove unnecessary user_fpu_end() in save_xstate_sig()
  x86, fpu: drop_fpu() before restoring new state from sigframe
  x86, fpu: Unify signal handling code paths for x86 and x86_64 kernels
  x86, fpu: Consolidate inline asm routines for saving/restoring fpu state
  x86, signal: Cleanup ifdefs and is_ia32, is_x32
---

ac07f5c3cb0cf19258c55cdf210aa4ac91ca7330
diff --cc arch/x86/kernel/cpu/common.c
index 134505e07b0,b0fe078614d..761cb354704
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@@ -1297,8 -1297,9 +1297,7 @@@ void __cpuinit cpu_init(void
  	dbg_restore_debug_regs();
  
  	fpu_init();
- 	xsave_init();
  
 -	raw_local_save_flags(kernel_eflags);
 -
  	if (is_uv_system())
  		uv_cpu_init();
  }
diff --cc arch/x86/kernel/traps.c
index cfbe3fc4158,4f4aba0551b..8276dc6794c
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@@ -644,7 -630,8 +645,9 @@@ EXPORT_SYMBOL_GPL(math_state_restore)
  dotraplinkage void __kprobes
  do_device_not_available(struct pt_regs *regs, long error_code)
  {
 +	exception_enter(regs);
+ 	BUG_ON(use_eager_fpu());
+ 
  #ifdef CONFIG_MATH_EMULATION
  	if (read_cr0() & X86_CR0_EM) {
  		struct math_emu_info info = { };