[PATCH 6.6.y 1/2] nvmet: replace use of system_wq with system_percpu_wq

[Sasha Levin <sashal@kernel.org>]

From: Marco Crivellari <marco.crivellari@suse.com>

[ Upstream commit 3d553be6d295b6cca8fd35cb673fd13934ac4cbc ]

This patch continues the effort to refactor workqueue APIs, which has begun
with the changes introducing new workqueues and a new alloc_workqueue flag:

   commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
   commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

The point of the refactoring is to eventually alter the default behavior of
workqueues to become unbound by default so that their workload placement is
optimized by the scheduler.

Before that to happen, workqueue users must be converted to the better named
new workqueues with no intended behaviour changes:

   system_wq -> system_percpu_wq
   system_unbound_wq -> system_dfl_wq

This way the old obsolete workqueues (system_wq, system_unbound_wq) can be
removed in the future.

Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/
Suggested-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Stable-dep-of: 53f6efe00cea ("nvmet-auth: serialize access to DH-HMAC-CHAP state to fix UAF")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/target/admin-cmd.c        | 2 +-
 drivers/nvme/target/fabrics-cmd-auth.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index c974beefa766b..32f01c00dc416 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -993,7 +993,7 @@ void nvmet_execute_keep_alive(struct nvmet_req *req)
 
 	pr_debug("ctrl %d update keep-alive timer for %d secs\n",
 		ctrl->cntlid, ctrl->kato);
-	mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
+	mod_delayed_work(system_percpu_wq, &ctrl->ka_work, ctrl->kato * HZ);
 out:
 	nvmet_req_complete(req, status);
 }
diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c
index 25a3a927ae231..8d97ced8b1d19 100644
--- a/drivers/nvme/target/fabrics-cmd-auth.c
+++ b/drivers/nvme/target/fabrics-cmd-auth.c
@@ -360,7 +360,7 @@ void nvmet_execute_auth_send(struct nvmet_req *req)
 	    req->sq->dhchap_step != NVME_AUTH_DHCHAP_MESSAGE_FAILURE2) {
 		unsigned long auth_expire_secs = ctrl->kato ? ctrl->kato : 120;
 
-		mod_delayed_work(system_wq, &req->sq->auth_expired_work,
+		mod_delayed_work(system_percpu_wq, &req->sq->auth_expired_work,
 				 auth_expire_secs * HZ);
 		goto complete;
 	}
-- 
2.53.0