From: Marco Crivellari Date: Fri, 5 Sep 2025 08:51:40 +0000 (+0200) Subject: drivers/block: replace use of system_unbound_wq with system_dfl_wq X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=456cefcb312d90d12dbcf7eaf6b3f7cfae6f622b;p=thirdparty%2Fkernel%2Fstable.git drivers/block: replace use of system_unbound_wq with system_dfl_wq Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistentcy cannot be addressed without refactoring the API. system_unbound_wq should be the default workqueue so as not to enforce locality constraints for random work whenever it's not required. Adding system_dfl_wq to encourage its use when unbound work should be used. queue_work() / queue_delayed_work() / mod_delayed_work() will now use the new unbound wq: whether the user still use the old wq a warn will be printed along with a wq redirect to the new one. The old system_unbound_wq will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Signed-off-by: Jens Axboe --- diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 8acad3cc6e6ea..78184d3c526aa 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1085,7 +1085,7 @@ static int read_from_bdev_sync(struct zram *zram, struct page *page, work.entry = entry; INIT_WORK_ONSTACK(&work.work, zram_sync_read); - queue_work(system_unbound_wq, &work.work); + queue_work(system_dfl_wq, &work.work); flush_work(&work.work); destroy_work_on_stack(&work.work);