From 82087414c608440c5ca7faa5c2fb6327daebcd15 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Wed, 4 Apr 2012 18:26:39 +0000 Subject: [PATCH] powerpc: No need to preserve count register across system call The count register is volatile so we don't need to preserve it. Store zero to the entry in the exception frame. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/entry_64.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 7f1e6de9a5a9..ba72ddbe5238 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -83,6 +83,7 @@ system_call_common: std r11,GPR11(r1) std r11,GPR12(r1) std r11,_XER(r1) + std r11,_CTR(r1) std r9,GPR13(r1) mfcr r9 mflr r10 @@ -90,8 +91,6 @@ system_call_common: std r9,_CCR(r1) std r10,_LINK(r1) std r11,_TRAP(r1) - mfctr r10 - std r10,_CTR(r1) std r3,ORIG_GPR3(r1) ld r2,PACATOC(r13) addi r9,r1,STACK_FRAME_OVERHEAD -- 2.11.0