powerpc/booke: fix fast syscall entry on SMP

Use r10 instead of r9 to calculate CPU offset as r9 contains
the value from SRR1 which is used later.

Fixes: 1a4b739bbb4f ("powerpc/32: implement fast entry for syscalls on BOOKE")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index bfeb469..9f9e0d1 100644 (file)
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -145,9 +145,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
        tophys(r11,r11)
        addi    r11,r11,global_dbcr0@l
 #ifdef CONFIG_SMP
-       lwz     r9,TASK_CPU(r2)
-       slwi    r9,r9,3
-       add     r11,r11,r9
+       lwz     r10, TASK_CPU(r2)
+       slwi    r10, r10, 3
+       add     r11, r11, r10
 #endif
        lwz     r12,0(r11)
        mtspr   SPRN_DBCR0,r12