[PATCH v2 2/3] nvme: add WQ_PERCPU to alloc_workqueue users

Marco Crivellari
2026-02-23T10:24:03Z

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.

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>
---
drivers/nvme/target/core.c | 5 +++--
drivers/nvme/target/tcp.c | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 5e43d0acc86e..376d38b62da2 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1942,12 +1942,13 @@ static int __init nvmet_init(void)
if (!nvmet_bvec_cache)
return -ENOMEM;

- zbd_wq = alloc_workqueue("nvmet-zbd-wq", WQ_MEM_RECLAIM, 0);
+ zbd_wq = alloc_workqueue("nvmet-zbd-wq", WQ_MEM_RECLAIM | WQ_PERCPU,
+ 0);
if (!zbd_wq)
goto out_destroy_bvec_cache;

buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq",
- WQ_MEM_RECLAIM, 0);
+ WQ_MEM_RECLAIM | WQ_PERCPU, 0);
if (!buffered_io_wq)
goto out_free_zbd_work_queue;

diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index acc71a26733f..4b8b02341ddc 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -2225,7 +2225,7 @@ static int __init nvmet_tcp_init(void)
int ret;

nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq",
- WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
+ WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_PERCPU, 0);
if (!nvmet_tcp_wq)
return -ENOMEM;

--
2.52.0