The hpte_need_flush() function accesses the ppc64_tlb_batch per-CPU
variable with preemption enabled, a bug that this patch fixes. Perhaps
crudely.
Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/pgtable-ppc64.h | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h
b/arch/powerpc/include/asm/pgtable-ppc64.h
index 2b09cd5..6ed08ab 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -228,8 +228,11 @@ static inline unsigned long pte_update(struct mm_struct
*mm,
assert_pte_locked(mm, addr);
#ifdef CONFIG_PPC_STD_MMU_64
- if (old & _PAGE_HASHPTE)
+ if (old & _PAGE_HASHPTE) {
+ preempt_disable();
hpte_need_flush(mm, addr, ptep, old, huge);
+ preempt_enable();
+ }
#endif
return old;
--
1.7.3.2
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