[PATCH -rcu] rculist: Replace reference to atomic_ops.rst

[Akira Yokosawa]

atomic_ops.rst was removed in commit f0400a77ebdc ("atomic: Delete
obsolete documentation").
Instead, reference a section in memory-barriers.txt discussing
the use of barrier() in loops.

Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx>
---
 include/linux/rculist_nulls.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/rculist_nulls.h b/include/linux/rculist_nulls.h
index ff3e94779e73..d8afdb8784c1 100644
--- a/include/linux/rculist_nulls.h
+++ b/include/linux/rculist_nulls.h
@@ -161,7 +161,7 @@ static inline void hlist_nulls_add_fake(struct hlist_nulls_node *n)
  *
  * The barrier() is needed to make sure compiler doesn't cache first element [1],
  * as this loop can be restarted [2]
- * [1] Documentation/core-api/atomic_ops.rst around line 114
+ * [1] Documentation/memory-barriers.txt around line 1533
  * [2] Documentation/RCU/rculist_nulls.rst around line 146
  */
 #define hlist_nulls_for_each_entry_rcu(tpos, pos, head, member)			\
-- 
2.17.1