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authorAnton Blanchard <anton@samba.org>2006-06-11 01:15:55 +1000
committerPaul Mackerras <paulus@samba.org>2006-06-15 19:31:26 +1000
commitbd19c8994a828e70b5472f0ce9df5831c6c3db84 (patch)
tree5462c6d574b995084aa9ed4472257851c4b6ad54 /arch/powerpc/kernel/entry_64.S
parent9e6e3c2c796f1e0ef335804d5c87073e365dea50 (diff)
[POWERPC] system call micro optimisation
In the syscall path we currently have: crclr so mfcr r9 If we shift the crclr up we can avoid a stall on some CPUs. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
-rw-r--r--arch/powerpc/kernel/entry_64.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 19ad5c6b181..221062c960c 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -57,6 +57,7 @@ system_call_common:
beq- 1f
ld r1,PACAKSAVE(r13)
1: std r10,0(r1)
+ crclr so
std r11,_NIP(r1)
std r12,_MSR(r1)
std r0,GPR0(r1)
@@ -75,7 +76,6 @@ system_call_common:
std r11,GPR11(r1)
std r11,GPR12(r1)
std r9,GPR13(r1)
- crclr so
mfcr r9
mflr r10
li r11,0xc01