[PATCH v1 11/15] powerpc/32: Use r1 directly instead of r11 in syscall prolog

[Christophe Leroy]

In syscall prolog, we don't need to keep the stack pointer in r11 as
we do in exception prolog. So r1 can be used directly to free r11.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/kernel/head_6xx_8xx.h | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/kernel/head_6xx_8xx.h 
b/arch/powerpc/kernel/head_6xx_8xx.h
index 540092fb90a9..2536f0a660af 100644
--- a/arch/powerpc/kernel/head_6xx_8xx.h
+++ b/arch/powerpc/kernel/head_6xx_8xx.h
@@ -101,26 +101,25 @@
        tovirt(r12, r12)
        stw     r11,GPR1(r1)
        stw     r11,0(r1)
-       mr      r11, r1
        mflr    r10
-       stw     r10, _LINK(r11)
+       stw     r10, _LINK(r1)
        mfctr   r10
-       stw     r10,_NIP(r11)
+       stw     r10,_NIP(r1)
        mfcr    r10
        rlwinm  r10,r10,0,4,2   /* Clear SO bit in CR */
-       stw     r10,_CCR(r11)           /* save registers */
+       stw     r10,_CCR(r1)            /* save registers */
        LOAD_REG_IMMEDIATE(r10, MSR_KERNEL & ~MSR_IR) /* can take exceptions */
        mtmsr   r10                     /* (except for mach check in rtas) */
        lis     r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
-       stw     r2,GPR2(r11)
+       stw     r2,GPR2(r1)
        addi    r10,r10,STACK_FRAME_REGS_MARKER@l
-       stw     r9,_MSR(r11)
+       stw     r9,_MSR(r1)
        li      r2, \trapno + 1
-       stw     r10,8(r11)
-       stw     r2,_TRAP(r11)
-       SAVE_GPR(0, r11)
-       SAVE_4GPRS(3, r11)
-       SAVE_2GPRS(7, r11)
+       stw     r10,8(r1)
+       stw     r2,_TRAP(r1)
+       SAVE_GPR(0, r1)
+       SAVE_4GPRS(3, r1)
+       SAVE_2GPRS(7, r1)
        addi    r11,r1,STACK_FRAME_OVERHEAD
        addi    r2,r12,-THREAD
        stw     r11,PT_REGS(r12)
-- 
2.25.0