[PATCH] powerpc/32s: fix flush_hash_pages() on SMP

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

Reported-by: Erhard F. <redacted>
Fixes: f7354ccac844 ("powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <redacted>
---
 arch/powerpc/mm/book3s32/hash_low.S | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s32/hash_low.S b/arch/powerpc/mm/book3s32/hash_low.S
index e27792d0b744..8366c2abeafc 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.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

-- 
2.13.3

On Thu, 2019-05-09 at 12:59:38 UTC, Christophe Leroy wrote:

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

Reported-by: Erhard F. <redacted>
Fixes: f7354ccac844 ("powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/397d2300b08cdee052053e362018cdb6

cheers