From: Andi Kleen <ak@suse.de>
Date: Sat, 16 Apr 2005 22:25:01 +0000 (-0700)
Subject: [PATCH] x86_64: Minor microoptimization in syscall entry slow path
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=36c1104e309fe93375e67cdbdb2a980f23965f3b;p=deliverable%2Flinux.git

[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 e126284db7a8..053d6e80c31f 100644
--- 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: