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x86: fix taking DNA during 64bit sigreturn

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restore sigcontext is taking a DNA exception while restoring FP context
from the user stack, during the sigreturn.  Appended patch fixes it by
doing clts() if the app doesn't touch FP during the signal handler
execution.  This will stop generating a DNA, during the fxrstor in the
sigreturn.

This improves 64-bit lat_sig numbers by ~30% on my core2 platform.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Siddha, Suresh B 2007-11-11 11:27:59 -08:00 committed by Linus Torvalds
parent efe44183f6
commit 92d140e21f
2 changed files with 10 additions and 4 deletions
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1
arch/x86/kernel/i387_64.c
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@ -92,6 +92,7 @@ int save_i387(struct _fpstate __user *buf)
if (task_thread_info(tsk)->status & TS_USEDFPU) {
err = save_i387_checking((struct i387_fxsave_struct __user *)buf);
if (err) return err;
task_thread_info(tsk)->status &= ~TS_USEDFPU;
stts();
} else {
if (__copy_to_user(buf, &tsk->thread.i387.fxsave,

5
include/asm-x86/i387_64.h
View File

@ -203,6 +203,11 @@ static inline void save_init_fpu(struct task_struct *tsk)
*/
static inline int restore_i387(struct _fpstate __user *buf)
{
set_used_math();
if (!(task_thread_info(current)->status & TS_USEDFPU)) {
clts();
task_thread_info(current)->status |= TS_USEDFPU;
}
return restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
}