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| author | Takashi Iwai <tiwai@suse.de> | 2014-10-27 14:52:29 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2014-10-27 14:52:29 +0300 |
| commit | d5432503bfb49f3425bad0b850714ffd8b533cfc (patch) | |
| tree | 97926e7eea0b6d8b0e8bf98748dd9c0ef4c718ad /include/linux/dynamic_queue_limits.h | |
| parent | 6a98e34b58919c52e8c8beec991759999af342da (diff) | |
| parent | c0d018bd5b1aabad59dffdec568e189359d93a14 (diff) | |
| download | linux-d5432503bfb49f3425bad0b850714ffd8b533cfc.tar.xz | |
Merge tag 'asoc-v3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Fixes for v3.18
A few small driver fixes for v3.18 plus the removal of the s6000 support
since the relevant chip is no longer supported in mainline.
Diffstat (limited to 'include/linux/dynamic_queue_limits.h')
| -rw-r--r-- | include/linux/dynamic_queue_limits.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/dynamic_queue_limits.h b/include/linux/dynamic_queue_limits.h index 5621547d631b..a4be70398ce1 100644 --- a/include/linux/dynamic_queue_limits.h +++ b/include/linux/dynamic_queue_limits.h @@ -73,14 +73,22 @@ static inline void dql_queued(struct dql *dql, unsigned int count) { BUG_ON(count > DQL_MAX_OBJECT); - dql->num_queued += count; dql->last_obj_cnt = count; + + /* We want to force a write first, so that cpu do not attempt + * to get cache line containing last_obj_cnt, num_queued, adj_limit + * in Shared state, but directly does a Request For Ownership + * It is only a hint, we use barrier() only. + */ + barrier(); + + dql->num_queued += count; } /* Returns how many objects can be queued, < 0 indicates over limit. */ static inline int dql_avail(const struct dql *dql) { - return dql->adj_limit - dql->num_queued; + return ACCESS_ONCE(dql->adj_limit) - ACCESS_ONCE(dql->num_queued); } /* Record number of completed objects and recalculate the limit. */ |