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[POWERPC] system call micro optimisation

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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>
This commit is contained in:
Anton Blanchard 2006-06-11 01:15:55 +10:00 committed by Paul Mackerras
parent 9e6e3c2c79
commit bd19c8994a
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/entry_64.S
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@ -57,6 +57,7 @@ system_call_common:
beq- 1f beq- 1f
ld r1,PACAKSAVE(r13) ld r1,PACAKSAVE(r13)
1: std r10,0(r1) 1: std r10,0(r1)
crclr so
std r11,_NIP(r1) std r11,_NIP(r1)
std r12,_MSR(r1) std r12,_MSR(r1)
std r0,GPR0(r1) std r0,GPR0(r1)
@ -75,7 +76,6 @@ system_call_common:
std r11,GPR11(r1) std r11,GPR11(r1)
std r11,GPR12(r1) std r11,GPR12(r1)
std r9,GPR13(r1) std r9,GPR13(r1)
crclr so
mfcr r9 mfcr r9
mflr r10 mflr r10
li r11,0xc01 li r11,0xc01