* [PATCH v2 2/2] block/blk-throttle: Add WQ_PERCPU to alloc_workqueue users
[not found] <20260223092920.60424-1-marco.crivellari@suse.com>
@ 2026-02-23 9:29 ` Marco Crivellari
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From: Marco Crivellari @ 2026-02-23 9:29 UTC (permalink / raw)
To: linux-kernel
Cc: Tejun Heo, Lai Jiangshan, Frederic Weisbecker,
Sebastian Andrzej Siewior, Marco Crivellari, Michal Hocko,
Jens Axboe, Josef Bacik, cgroups
This continues the effort to refactor workqueue APIs, which began with
the introduction of new workqueues and a new alloc_workqueue flag in:
commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")
The refactoring is going to alter the default behavior of
alloc_workqueue() to be unbound by default.
With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND),
any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND
must now use WQ_PERCPU. For more details see the Link tag below.
In order to keep alloc_workqueue() behavior identical, explicitly request
WQ_PERCPU.
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: cgroups@vger.kernel.org
Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
---
block/blk-throttle.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 97188a795848..cabf91f0d0dc 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1839,7 +1839,7 @@ void blk_throtl_exit(struct gendisk *disk)
static int __init throtl_init(void)
{
- kthrotld_workqueue = alloc_workqueue("kthrotld", WQ_MEM_RECLAIM, 0);
+ kthrotld_workqueue = alloc_workqueue("kthrotld", WQ_MEM_RECLAIM | WQ_PERCPU, 0);
if (!kthrotld_workqueue)
panic("Failed to create kthrotld\n");
--
2.52.0
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