[PATCH v2] RDMA/rxe: Replace use of system_unbound_wq with rxe_wq

[Marco Crivellari <marco.crivellari@suse.com>]

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.

This specific driver already allocate an unbound workqueue named "rxe_wq",
so replace system_unbound_wq with this one instead of system_dfl_wq.

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>
---
Changes in v2:
- use of rxe_wq instead of the new system_dfl_wq.
- removed the "static" key from rxe_wq definition making it extern in the
  header file.

---
 drivers/infiniband/sw/rxe/rxe.h      | 2 ++
 drivers/infiniband/sw/rxe/rxe_odp.c  | 2 +-
 drivers/infiniband/sw/rxe/rxe_task.c | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe.h b/drivers/infiniband/sw/rxe/rxe.h
index ff8cd53f5f28..c56bae376c7f 100644
--- a/drivers/infiniband/sw/rxe/rxe.h
+++ b/drivers/infiniband/sw/rxe/rxe.h
@@ -121,4 +121,6 @@ void rxe_port_up(struct rxe_dev *rxe);
 void rxe_port_down(struct rxe_dev *rxe);
 void rxe_set_port_state(struct rxe_dev *rxe);
 
+extern struct workqueue_struct *rxe_wq;
+
 #endif /* RXE_H */
diff --git a/drivers/infiniband/sw/rxe/rxe_odp.c b/drivers/infiniband/sw/rxe/rxe_odp.c
index bc11b1ec59ac..ff904d5e54a7 100644
--- a/drivers/infiniband/sw/rxe/rxe_odp.c
+++ b/drivers/infiniband/sw/rxe/rxe_odp.c
@@ -545,7 +545,7 @@ static int rxe_ib_advise_mr_prefetch(struct ib_pd *ibpd,
 		work->frags[i].mr = mr;
 	}
 
-	queue_work(system_unbound_wq, &work->work);
+	queue_work(rxe_wq, &work->work);
 
 	return 0;
 
diff --git a/drivers/infiniband/sw/rxe/rxe_task.c b/drivers/infiniband/sw/rxe/rxe_task.c
index f522820b950c..801d06c969c9 100644
--- a/drivers/infiniband/sw/rxe/rxe_task.c
+++ b/drivers/infiniband/sw/rxe/rxe_task.c
@@ -6,7 +6,7 @@
 
 #include "rxe.h"
 
-static struct workqueue_struct *rxe_wq;
+struct workqueue_struct *rxe_wq;
 
 int rxe_alloc_wq(void)
 {
-- 
2.53.0