x86: fix taking DNA during 64bit sigreturn

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>

1 files changed, 5 insertions, 4 deletions

diff --git a/arch/x86/kernel/i387_64.c b/arch/x86/kernel/i387_64.c
index 56c1f1147109..bfaff28fb134 100644
--- a/arch/x86/kernel/i387_64.c
+++ b/arch/x86/kernel/i387_64.c
@@ -92,13 +92,14 @@ 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, 
+        } else {
+                if (__copy_to_user(buf, &tsk->thread.i387.fxsave,
                                    sizeof(struct i387_fxsave_struct)))
                         return -1;
-        } 
-                return 1;
+        }
+        return 1;
 }
 
 /*