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Merge tag 'block-5.16-2021-12-17' of git://git.kernel.dk/linux-block

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Pull block fixes from Jens Axboe:

 - Fix for hammering on the delayed run queue timer (me)

 - bcache regression fix for this merge window (Lin)

 - Fix a divide-by-zero in the blk-iocost code (Tejun)

* tag 'block-5.16-2021-12-17' of git://git.kernel.dk/linux-block:
  bcache: fix NULL pointer reference in cached_dev_detach_finish
  block: reduce kblockd_mod_delayed_work_on() CPU consumption
  iocost: Fix divide-by-zero on donation from low hweight cgroup
This commit is contained in:
Linus Torvalds
2021-12-17 11:46:07 -08:00
parent cb29eee3b2 aa97f6cdb7
commit fa09ca5ebc
3 changed files with 12 additions and 2 deletions
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2
block/blk-core.c
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@@ -1484,6 +1484,8 @@ EXPORT_SYMBOL(kblockd_schedule_work);
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork,
unsigned long delay)
{
if (!delay)
return queue_work_on(cpu, kblockd_workqueue, &dwork->work);
return mod_delayed_work_on(cpu, kblockd_workqueue, dwork, delay);
}
EXPORT_SYMBOL(kblockd_mod_delayed_work_on);

9
block/blk-iocost.c
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@@ -2311,7 +2311,14 @@ static void ioc_timer_fn(struct timer_list *timer)
hwm = current_hweight_max(iocg);
new_hwi = hweight_after_donation(iocg, old_hwi, hwm,
usage, &now);
if (new_hwi < hwm) {
/*
* Donation calculation assumes hweight_after_donation
* to be positive, a condition that a donor w/ hwa < 2
* can't meet. Don't bother with donation if hwa is
* below 2. It's not gonna make a meaningful difference
* anyway.
*/
if (new_hwi < hwm && hwa >= 2) {
iocg->hweight_donating = hwa;
iocg->hweight_after_donation = new_hwi;
list_add(&iocg->surplus_list, &surpluses);

3
drivers/md/bcache/super.c
View File

@@ -1139,6 +1139,7 @@ static void cancel_writeback_rate_update_dwork(struct cached_dev *dc)
static void cached_dev_detach_finish(struct work_struct *w)
{
struct cached_dev *dc = container_of(w, struct cached_dev, detach);
struct cache_set *c = dc->disk.c;
BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
BUG_ON(refcount_read(&dc->count));
@@ -1156,7 +1157,7 @@ static void cached_dev_detach_finish(struct work_struct *w)
bcache_device_detach(&dc->disk);
list_move(&dc->list, &uncached_devices);
calc_cached_dev_sectors(dc->disk.c);
calc_cached_dev_sectors(c);
clear_bit(BCACHE_DEV_DETACHING, &dc->disk.flags);
clear_bit(BCACHE_DEV_UNLINK_DONE, &dc->disk.flags);