AuxXxilium/linux_dsm_epyc7002
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Merge branch 'for-linus' of git://git.kernel.dk/linux-block

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Pull block layer fix from Jens Axboe:
 "A single fix for a lockdep splat reported by Thomas and Gabriel"

* 'for-linus' of git://git.kernel.dk/linux-block:
  cfq-iosched: don't call wbt_disable_default() with IRQs disabled
This commit is contained in:
Linus Torvalds 2017-02-17 13:01:58 -08:00
commit 6dc39c50e4
1 changed files with 13 additions and 12 deletions
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25
block/cfq-iosched.c
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@ -3758,7 +3758,7 @@ static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
static bool check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
{
struct cfq_data *cfqd = cic_to_cfqd(cic);
struct cfq_queue *cfqq;
@ -3775,15 +3775,7 @@ static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
* spuriously on a newly created cic but there's no harm.
*/
if (unlikely(!cfqd) || likely(cic->blkcg_serial_nr == serial_nr))
return;
/*
* If we have a non-root cgroup, we can depend on that to
* do proper throttling of writes. Turn off wbt for that
* case, if it was enabled by default.
*/
if (nonroot_cg)
wbt_disable_default(cfqd->queue);
return nonroot_cg;
/*
* Drop reference to queues. New queues will be assigned in new
@ -3804,9 +3796,13 @@ static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
}
cic->blkcg_serial_nr = serial_nr;
return nonroot_cg;
}
#else
static inline void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) { }
static inline bool check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
{
return false;
}
#endif /* CONFIG_CFQ_GROUP_IOSCHED */
static struct cfq_queue **
@ -4448,11 +4444,12 @@ cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
const int rw = rq_data_dir(rq);
const bool is_sync = rq_is_sync(rq);
struct cfq_queue *cfqq;
bool disable_wbt;
spin_lock_irq(q->queue_lock);
check_ioprio_changed(cic, bio);
check_blkcg_changed(cic, bio);
disable_wbt = check_blkcg_changed(cic, bio);
new_queue:
cfqq = cic_to_cfqq(cic, is_sync);
if (!cfqq || cfqq == &cfqd->oom_cfqq) {
@ -4488,6 +4485,10 @@ cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
rq->elv.priv[0] = cfqq;
rq->elv.priv[1] = cfqq->cfqg;
spin_unlock_irq(q->queue_lock);
if (disable_wbt)
wbt_disable_default(q);
return 0;
}