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 <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 7f1e6de..ba72ddb 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -83,6 +83,7 @@
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 @@
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