[PATCH v4 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing

[Leonardo Bras <leonardo@xxxxxxxxxxxxx>]

Skips slow part of serialize_against_pte_lookup if there is no running
lockless pagetable walk.

Signed-off-by: Leonardo Bras <leonardo@xxxxxxxxxxxxx>
---
 arch/powerpc/mm/book3s64/pgtable.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 6ba6195bff1b..27966481f2a6 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -95,7 +95,8 @@ static void do_nothing(void *unused)
 void serialize_against_pte_lookup(struct mm_struct *mm)
 {
 	smp_mb();
-	smp_call_function_many(mm_cpumask(mm), do_nothing, NULL, 1);
+	if (running_lockless_pgtbl_walk(mm))
+		smp_call_function_many(mm_cpumask(mm), do_nothing, NULL, 1);
 }
 
 /*
-- 
2.20.1