[PATCH] x86_64: Minor microoptimization in syscall entry slow path

Minor microoptimization in syscall entry slow path

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index e126284..053d6e8 100644 (file)
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -302,9 +302,7 @@ int_very_careful:
        leaq 8(%rsp),%rdi       # &ptregs -> arg1       
        call syscall_trace_leave
        popq %rdi
-       btr  $TIF_SYSCALL_TRACE,%edi
-       btr  $TIF_SYSCALL_AUDIT,%edi
-       btr  $TIF_SINGLESTEP,%edi
+       andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi
        jmp int_restore_rest
        
 int_signal: