From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 21 Oct 2010 20:34:32 +0000 (-0700)
Subject: Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git... 
X-Git-Tag: firefly_0821_release~7613^2~3729
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=b6f7e38dbb310557fe890b04b1a376c93f638c3b;p=firefly-linux-kernel-4.4.55.git

Merge branch 'x86-fpu-for-linus' of git://git./linux/kernel/git/tip/linux-2.6-tip

* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, fpu: Merge fpu_save_init()
  x86-32, fpu: Rewrite fpu_save_init()
  x86, fpu: Remove PSHUFB_XMM5_* macros
  x86, fpu: Remove unnecessary ifdefs from i387 code.
  x86-32, fpu: Remove math_emulate stub
  x86-64, fpu: Simplify constraints for fxsave/fxtstor
  x86-64, fpu: Fix %cs value in convert_from_fxsr()
  x86-64, fpu: Disable preemption when using TS_USEDFPU
  x86, fpu: Merge __save_init_fpu()
  x86, fpu: Merge tolerant_fwait()
  x86, fpu: Merge fpu_init()
  x86: Use correct type for %cr4
  x86, xsave: Disable xsave in i387 emulation mode

Fixed up fxsaveq-induced conflict in arch/x86/include/asm/i387.h
---

b6f7e38dbb310557fe890b04b1a376c93f638c3b
diff --cc arch/x86/include/asm/i387.h
index 70f105b352ee,70626ed96cb5..4aa2bb3b242a
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@@ -174,57 -140,26 +140,30 @@@ static inline void fpu_fxsave(struct fp
  	/* Using "rex64; fxsave %0" is broken because, if the memory operand
  	   uses any extended registers for addressing, a second REX prefix
  	   will be generated (to the assembler, rex64 followed by semicolon
 -	   is a separate instruction), and hence the 64-bitness is lost.
 -	   Using "fxsaveq %0" would be the ideal choice, but is only supported
 -	   starting with gas 2.16.
 -	asm volatile("fxsaveq %0"
 -		     : "=m" (fpu->state->fxsave));
 -	   Using, as a workaround, the properly prefixed form below isn't
 +	   is a separate instruction), and hence the 64-bitness is lost. */
++
 +#ifdef CONFIG_AS_FXSAVEQ
 +	/* Using "fxsaveq %0" would be the ideal choice, but is only supported
 +	   starting with gas 2.16. */
 +	__asm__ __volatile__("fxsaveq %0"
 +			     : "=m" (fpu->state->fxsave));
- #elif 0
++#else
 +	/* Using, as a workaround, the properly prefixed form below isn't
  	   accepted by any binutils version so far released, complaining that
  	   the same type of prefix is used twice if an extended register is
- 	   needed for addressing (fix submitted to mainline 2005-11-21). */
- 	__asm__ __volatile__("rex64/fxsave %0"
- 			     : "=m" (fpu->state->fxsave));
- #else
- 	/* This, however, we can work around by forcing the compiler to select
+ 	   needed for addressing (fix submitted to mainline 2005-11-21).
+ 	asm volatile("rex64/fxsave %0"
+ 		     : "=m" (fpu->state->fxsave));
+ 	   This, however, we can work around by forcing the compiler to select
  	   an addressing mode that doesn't require extended registers. */
- 	__asm__ __volatile__("rex64/fxsave (%1)"
- 			     : "=m" (fpu->state->fxsave)
- 			     : "cdaSDb" (&fpu->state->fxsave));
+ 	asm volatile("rex64/fxsave (%[fx])"
+ 		     : "=m" (fpu->state->fxsave)
+ 		     : [fx] "R" (&fpu->state->fxsave));
 +#endif
  }
  
- static inline void fpu_save_init(struct fpu *fpu)
- {
- 	if (use_xsave())
- 		fpu_xsave(fpu);
- 	else
- 		fpu_fxsave(fpu);
- 
- 	fpu_clear(fpu);
- }
- 
- static inline void __save_init_fpu(struct task_struct *tsk)
- {
- 	fpu_save_init(&tsk->thread.fpu);
- 	task_thread_info(tsk)->status &= ~TS_USEDFPU;
- }
- 
  #else  /* CONFIG_X86_32 */
  
- #ifdef CONFIG_MATH_EMULATION
- extern void finit_soft_fpu(struct i387_soft_struct *soft);
- #else
- static inline void finit_soft_fpu(struct i387_soft_struct *soft) {}
- #endif
- 
- static inline void tolerant_fwait(void)
- {
- 	asm volatile("fnclex ; fwait");
- }
- 
  /* perform fxrstor iff the processor has extended states, otherwise frstor */
  static inline int fxrstor_checking(struct i387_fxsave_struct *fx)
  {