Subject: [PATCH v2 1/3] powerpc/64s/radix: fix preempt imbalance in TLB flush

From: Nicholas Piggin <[email-masked]>
Date: Tue, 24 Oct 2017 23:06:52 +1000

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/mm/tlb-radix.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
index 3a07d7a5e2fe..892544ebc2d2 100644
--- a/arch/powerpc/mm/tlb-radix.c
+++ b/arch/powerpc/mm/tlb-radix.c
@@ -358,7 +358,7 @@ void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
 	unsigned long ap = mmu_get_ap(mmu_virtual_psize);
 	unsigned long pid, end;
 
-
+	preempt_disable();
 	pid = mm->context.id;
 	if (unlikely(pid == MMU_NO_CONTEXT))
 		goto no_context;
@@ -366,6 +366,7 @@ void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
 	/* 4k page size, just blow the world */
 	if (PAGE_SIZE == 0x1000) {
 		radix__flush_all_mm(mm);
+		preempt_enable();
 		return;
 	}
 
-- 
2.13.3