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| author | Maxime Ripard <maxime@cerno.tech> | 2020-04-04 11:02:15 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2020-04-04 11:02:15 +0200 |
| commit | cc46c03397c1865a181f1a4f66d4645806e5a943 (patch) | |
| tree | e3a762d8961219a61b96ae6e5ec875ba9fbe2314 /include/linux/blktrace_api.h | |
| parent | d8a26d8fc37c5b8b9e95f2fa194f287cf8cab3f4 (diff) | |
| parent | 0e7e6198af28c1573267aba1be33dd0b7fb35691 (diff) | |
| download | kernel_replicant_linux-cc46c03397c1865a181f1a4f66d4645806e5a943.tar.gz kernel_replicant_linux-cc46c03397c1865a181f1a4f66d4645806e5a943.tar.bz2 kernel_replicant_linux-cc46c03397c1865a181f1a4f66d4645806e5a943.zip | |
Merge drm/drm-next into drm-misc-next-fixes
Alex needs v5.6 into drm-misc-next-fixes to merge a fix for a regression in
the scatterlist processing in PRIME.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Diffstat (limited to 'include/linux/blktrace_api.h')
| -rw-r--r-- | include/linux/blktrace_api.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index 7bb2d8de9f30..3b6ff5902edc 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -51,9 +51,13 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f **/ #define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \ do { \ - struct blk_trace *bt = (q)->blk_trace; \ + struct blk_trace *bt; \ + \ + rcu_read_lock(); \ + bt = rcu_dereference((q)->blk_trace); \ if (unlikely(bt)) \ __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\ + rcu_read_unlock(); \ } while (0) #define blk_add_trace_msg(q, fmt, ...) \ blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__) @@ -61,10 +65,14 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f static inline bool blk_trace_note_message_enabled(struct request_queue *q) { - struct blk_trace *bt = q->blk_trace; - if (likely(!bt)) - return false; - return bt->act_mask & BLK_TC_NOTIFY; + struct blk_trace *bt; + bool ret; + + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + ret = bt && (bt->act_mask & BLK_TC_NOTIFY); + rcu_read_unlock(); + return ret; } extern void blk_add_driver_data(struct request_queue *q, struct request *rq, |