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x86/fpu: Use a symbolic name for asm operand 

Fix up the else-case in fpu_fxsave() which seems like it has
been overlooked. Correct comment style in restore_fpu_checking()
while at it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1419170543-11393-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2014-12-21 15:02:23 +01:00 committed by Ingo Molnar
parent 97bf6af1f9
commit 6ca7a8a150
1 changed files with 6 additions and 4 deletions
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10
arch/x86/include/asm/fpu-internal.h
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@ -207,7 +207,7 @@ static inline void fpu_fxsave(struct fpu *fpu)
if (config_enabled(CONFIG_X86_32))
asm volatile( "fxsave %[fx]" : [fx] "=m" (fpu->state->fxsave));
else if (config_enabled(CONFIG_AS_FXSAVEQ))
asm volatile("fxsaveq %0" : "=m" (fpu->state->fxsave));
asm volatile("fxsaveq %[fx]" : [fx] "=m" (fpu->state->fxsave));
else {
/* Using "rex64; fxsave %0" is broken because, if the memory
* operand uses any extended registers for addressing, a second
@ -290,9 +290,11 @@ static inline int fpu_restore_checking(struct fpu *fpu)
static inline int restore_fpu_checking(struct task_struct *tsk)
{
/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
is pending. Clear the x87 state here by setting it to fixed
values. "m" is a random variable that should be in L1 */
/*
* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is
* pending. Clear the x87 state here by setting it to fixed values.
* "m" is a random variable that should be in L1.
*/
if (unlikely(static_cpu_has_bug_safe(X86_BUG_FXSAVE_LEAK))) {
asm volatile(
"fnclex\n\t"