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* [PATCH] powerpc/8xx: Fix instruction TLB miss exception with perf enabled
@ 2020-10-09  5:36 Christophe Leroy
  0 siblings, 0 replies; only message in thread
From: Christophe Leroy @ 2020-10-09  5:36 UTC (permalink / raw)
  To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
  Cc: linuxppc-dev, linux-kernel

When perf is enabled, r11 must also be restored when CONFIG_HUGETLBFS
is selected.

Fixes: a891c43b97d3 ("powerpc/8xx: Prepare handlers for _PAGE_HUGE for 512k pages.")
Signed-off-by: Christophe Leroy <>
 arch/powerpc/kernel/head_8xx.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 9f359d3fba74..32d85387bdc5 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -268,7 +268,7 @@ InstructionTLBMiss:
 	addi	r10, r10, 1
 	stw	r10, (itlb_miss_counter - PAGE_OFFSET)@l(0)
 	mfspr	r10, SPRN_SPRG_SCRATCH0
-#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_SWAP)
+#if defined(ITLB_MISS_KERNEL) || defined(CONFIG_SWAP) || defined(CONFIG_HUGETLBFS)
 	mfspr	r11, SPRN_SPRG_SCRATCH1

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2020-10-09  5:36 [PATCH] powerpc/8xx: Fix instruction TLB miss exception with perf enabled Christophe Leroy

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