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Subject[PATCH 5.1 123/128] powerpc/32s: fix flush_hash_pages() on SMP
Date
From: Christophe Leroy <christophe.leroy@c-s.fr>

commit 397d2300b08cdee052053e362018cdb6dd65eea2 upstream.

flush_hash_pages() runs with data translation off, so current
task_struct has to be accesssed using physical address.

Fixes: f7354ccac844 ("powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU")
Cc: stable@vger.kernel.org # v5.1+
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/powerpc/mm/hash_low_32.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -539,7 +539,8 @@ _GLOBAL(flush_hash_pages)
#ifdef CONFIG_SMP
lis r9, (mmu_hash_lock - PAGE_OFFSET)@ha
addi r9, r9, (mmu_hash_lock - PAGE_OFFSET)@l
- lwz r8,TASK_CPU(r2)
+ tophys (r8, r2)
+ lwz r8, TASK_CPU(r8)
oris r8,r8,9
10: lwarx r0,0,r9
cmpi 0,r0,0

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