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powerpc/booke: fix fast syscall entry on SMP

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

Fixes: 1a4b739bbb ("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>
This commit is contained in:
Christophe Leroy 2019-06-13 13:52:30 +00:00 committed by Michael Ellerman
parent b7f8b440f3
commit e8732ffa2e
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kernel/head_booke.h
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@ -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