diff options
| author | Mark Brown <broonie@linaro.org> | 2013-06-14 10:16:06 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-06-14 10:16:06 +0100 |
| commit | 384b8345589cbbb18a99ce1b112da90c58c802e8 (patch) | |
| tree | 51fee39fa19adad6b24fb90123e7a0ca3159c9c5 /include/linux/rculist_nulls.h | |
| parent | 9c24b1672283644adf871244771ebf387dd73f90 (diff) | |
| parent | 2e7ee15ced914e109a1a5b6dfcd463d846a13bd5 (diff) | |
Merge branch 'fix/wm8962' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-wm8962
Conflicts:
sound/soc/codecs/wm8962.c
Diffstat (limited to 'include/linux/rculist_nulls.h')
| -rw-r--r-- | include/linux/rculist_nulls.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/rculist_nulls.h b/include/linux/rculist_nulls.h index 2ae13714828b..1c33dd7da4a7 100644 --- a/include/linux/rculist_nulls.h +++ b/include/linux/rculist_nulls.h @@ -105,9 +105,14 @@ static inline void hlist_nulls_add_head_rcu(struct hlist_nulls_node *n, * @head: the head for your list. * @member: the name of the hlist_nulls_node within the struct. * + * The barrier() is needed to make sure compiler doesn't cache first element [1], + * as this loop can be restarted [2] + * [1] Documentation/atomic_ops.txt around line 114 + * [2] Documentation/RCU/rculist_nulls.txt around line 146 */ #define hlist_nulls_for_each_entry_rcu(tpos, pos, head, member) \ - for (pos = rcu_dereference_raw(hlist_nulls_first_rcu(head)); \ + for (({barrier();}), \ + pos = rcu_dereference_raw(hlist_nulls_first_rcu(head)); \ (!is_a_nulls(pos)) && \ ({ tpos = hlist_nulls_entry(pos, typeof(*tpos), member); 1; }); \ pos = rcu_dereference_raw(hlist_nulls_next_rcu(pos))) |