1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index cc359636cfa3..f5df8f687b4d 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -456,4 +456,23 @@ read_sequnlock_excl_irqrestore(seqlock_t *sl, unsigned long flags)
         spin_unlock_irqrestore(&sl->lock, flags);
 }
 
+static inline unsigned long
+read_seqbegin_or_lock_irqsave(seqlock_t *lock, int *seq)
+{
+        unsigned long flags = 0;
+
+        if (!(*seq & 1))        /* Even */
+                *seq = read_seqbegin(lock);
+        else                    /* Odd */
+                read_seqlock_excl_irqsave(lock, flags);
+
+        return flags;
+}
+
+static inline void
+done_seqretry_irqrestore(seqlock_t *lock, int seq, unsigned long flags)
+{
+        if (seq & 1)
+                read_sequnlock_excl_irqrestore(lock, flags);
+}
 #endif /* __LINUX_SEQLOCK_H */