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fs: replace use of system_wq with system_percpu_wq

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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_wq is a per-CPU worqueue, yet nothing in its name tells about that
CPU affinity constraint, which is very often not required by users.
Make it clear by adding a system_percpu_wq to all the fs subsystem.

The old wq will be kept for a few release cylces.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Link: https://lore.kernel.org/20250916082906.77439-3-marco.crivellari@suse.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Marco Crivellari
2025-09-16 10:29:05 +02:00
committed by Christian Brauner
parent 7a4f92d39f
commit 4ef64db060
6 changed files with 6 additions and 6 deletions
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2
fs/nfs/namespace.c
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@@ -335,7 +335,7 @@ static int param_set_nfs_timeout(const char *val, const struct kernel_param *kp)
num *= HZ;
*((int *)kp->arg) = num;
if (!list_empty(&nfs_automount_list))
mod_delayed_work(system_wq, &nfs_automount_task, num);
mod_delayed_work(system_percpu_wq, &nfs_automount_task, num);
} else {
*((int *)kp->arg) = -1*HZ;
cancel_delayed_work(&nfs_automount_task);