diff mbox series

[v5,11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing

Message ID 20191003013325.2614-12-leonardo@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series Introduces new count-based method for tracking lockless pagetable walks | expand

Commit Message

Leonardo Bras Oct. 3, 2019, 1:33 a.m. UTC 
Skips slow part of serialize_against_pte_lookup if there is no running
lockless pagetable walk.

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

Patch

diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index ae557fdce9a3..0fef9400f210 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);
 }
 
 /*