block: Use u64_stats_init() to initialize seqcounts
Now that seqcounts are lockdep enabled objects, we need to explicitly
initialize runtime allocated seqcounts so that lockdep can track them.
Without this patch, Fengguang was seeing:
[ 4.127282] INFO: trying to register non-static key.
[ 4.128027] the code is fine but needs lockdep annotation.
[ 4.128027] turning off the locking correctness validator.
[ 4.128027] CPU: 0 PID: 96 Comm: kworker/u4:1 Not tainted 3.12.0-next-20131108-10601-gbad570d #2
[ 4.128027] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ ... ]
[ 4.128027] Call Trace:
[ 4.128027] [<7908e744>] ? console_unlock+0x353/0x380
[ 4.128027] [<79dc7cf2>] dump_stack+0x48/0x60
[ 4.128027] [<7908953e>] __lock_acquire.isra.26+0x7e3/0xceb
[ 4.128027] [<7908a1c5>] lock_acquire+0x71/0x9a
[ 4.128027] [<794079aa>] ? blk_throtl_bio+0x1c3/0x485
[ 4.128027] [<7940658b>] throtl_update_dispatch_stats+0x7c/0x153
[ 4.128027] [<794079aa>] ? blk_throtl_bio+0x1c3/0x485
[ 4.128027] [<794079aa>] blk_throtl_bio+0x1c3/0x485
...
Use u64_stats_init() for all affected data structures, which initializes
the seqcount.
Reported-and-Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[ Folded in another fix from the mailing list as well as a fix to that fix. Tweaked commit message. ]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1384314134-6895-1-git-send-email-john.stultz@linaro.org
[ So I actually think that the two SOBs from PeterZ are the right depiction of the patch route. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 434944c..4d5cec1 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1508,6 +1508,29 @@
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
+static void cfqg_stats_init(struct cfqg_stats *stats)
+{
+ blkg_rwstat_init(&stats->service_bytes);
+ blkg_rwstat_init(&stats->serviced);
+ blkg_rwstat_init(&stats->merged);
+ blkg_rwstat_init(&stats->service_time);
+ blkg_rwstat_init(&stats->wait_time);
+ blkg_rwstat_init(&stats->queued);
+
+ blkg_stat_init(&stats->sectors);
+ blkg_stat_init(&stats->time);
+
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ blkg_stat_init(&stats->unaccounted_time);
+ blkg_stat_init(&stats->avg_queue_size_sum);
+ blkg_stat_init(&stats->avg_queue_size_samples);
+ blkg_stat_init(&stats->dequeue);
+ blkg_stat_init(&stats->group_wait_time);
+ blkg_stat_init(&stats->idle_time);
+ blkg_stat_init(&stats->empty_time);
+#endif
+}
+
static void cfq_pd_init(struct blkcg_gq *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
@@ -1515,6 +1538,8 @@
cfq_init_cfqg_base(cfqg);
cfqg->weight = blkg->blkcg->cfq_weight;
cfqg->leaf_weight = blkg->blkcg->cfq_leaf_weight;
+ cfqg_stats_init(&cfqg->stats);
+ cfqg_stats_init(&cfqg->dead_stats);
}
static void cfq_pd_offline(struct blkcg_gq *blkg)