x86: don't save ebx in putuser_32.S.

Clobber it in the inline asm macros, and let the compiler do this for us.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 11 deletions

diff --git a/arch/x86/lib/putuser_32.S b/arch/x86/lib/putuser_32.S
index f58fba109d18..5b2a926f0e28 100644
--- a/arch/x86/lib/putuser_32.S
+++ b/arch/x86/lib/putuser_32.S
@@ -26,14 +26,8 @@
  */
 
 #define ENTER   CFI_STARTPROC ; \
-                pushl %ebx ; \
-                CFI_ADJUST_CFA_OFFSET 4 ; \
-                CFI_REL_OFFSET ebx, 0 ; \
                 GET_THREAD_INFO(%ebx)
-#define EXIT    popl %ebx ; \
-                CFI_ADJUST_CFA_OFFSET -4 ; \
-                CFI_RESTORE ebx ; \
-                ret ; \
+#define EXIT    ret ; \
                 CFI_ENDPROC
 
 .text
@@ -81,10 +75,7 @@ ENTRY(__put_user_8)
 ENDPROC(__put_user_8)
 
 bad_put_user:
-        CFI_STARTPROC simple
-        CFI_DEF_CFA esp, 2*4
-        CFI_OFFSET eip, -1*4
-        CFI_OFFSET ebx, -2*4
+        CFI_STARTPROC
         movl $-14,%eax
         EXIT
 END(bad_put_user)