1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index dcc64b9bfc41..cce6e7453592 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -236,6 +236,17 @@ static inline void raw_write_seqcount_end(seqcount_t *s)
 }
 
 /*
+ * raw_write_seqcount_latch - redirect readers to even/odd copy
+ * @s: pointer to seqcount_t
+ */
+static inline void raw_write_seqcount_latch(seqcount_t *s)
+{
+       smp_wmb();      /* prior stores before incrementing "sequence" */
+       s->sequence++;
+       smp_wmb();      /* increment "sequence" before following stores */
+}
+
+/*
  * Sequence counter only version assumes that callers are using their
  * own mutexing.
  */