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rculist: Replace reference to atomic_ops.rst 

The hlist_nulls_for_each_entry_rcu() docbook header references the
atomic_ops.rst file, which was removed in commit f0400a77eb ("atomic:
Delete obsolete documentation").  This commit therefore substitutes a
section in memory-barriers.txt discussing the use of barrier() in loops.

Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Akira Yokosawa 2021-01-16 00:11:45 +09:00 committed by Paul E. McKenney
parent 6494ccb932
commit 5bb1369d4b
1 changed files with 1 additions and 1 deletions
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include/linux/rculist_nulls.h
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@ -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) \