diff options
| author | Marco Crivellari <marco.crivellari@suse.com> | 2025-09-22 12:24:07 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-09-23 09:52:41 +0200 |
| commit | 1e06a137513dff9835e57f76cff177cb1e2e5475 (patch) | |
| tree | afdd97469d35255bb4a85a25261270de0a9851ee | |
| parent | 17f34ab55a8518ecbd5dcacec48e6ee903f7c1d0 (diff) | |
wifi: libertas: WQ_PERCPU added to alloc_workqueue users
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.
alloc_workqueue() treats all queues as per-CPU by default, while unbound
workqueues must opt-in via WQ_UNBOUND.
This default is suboptimal: most workloads benefit from unbound queues,
allowing the scheduler to place worker threads where they’re needed and
reducing noise when CPUs are isolated.
This change add a new WQ_PERCPU flag, to explicitly request the use of
the per-CPU behavior. Both flags coexist for one release cycle to allow
callers to transition their calls.
Once migration is complete, WQ_UNBOUND can be removed and unbound will
become the implicit 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.
All existing users have been updated accordingly.
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Link: https://patch.msgid.link/20250922102407.186660-2-marco.crivellari@suse.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | drivers/net/wireless/marvell/libertas/if_sdio.c | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/marvell/libertas/if_spi.c | 3 | ||||
| -rw-r--r-- | drivers/net/wireless/marvell/libertas_tf/main.c | 2 |
3 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/wireless/marvell/libertas/if_sdio.c b/drivers/net/wireless/marvell/libertas/if_sdio.c index 524034699972..1e29e80cad61 100644 --- a/drivers/net/wireless/marvell/libertas/if_sdio.c +++ b/drivers/net/wireless/marvell/libertas/if_sdio.c @@ -1181,7 +1181,8 @@ static int if_sdio_probe(struct sdio_func *func, spin_lock_init(&card->lock); INIT_LIST_HEAD(&card->packets); - card->workqueue = alloc_workqueue("libertas_sdio", WQ_MEM_RECLAIM, 0); + card->workqueue = alloc_workqueue("libertas_sdio", + WQ_MEM_RECLAIM | WQ_PERCPU, 0); if (unlikely(!card->workqueue)) { ret = -ENOMEM; goto err_queue; diff --git a/drivers/net/wireless/marvell/libertas/if_spi.c b/drivers/net/wireless/marvell/libertas/if_spi.c index b722a6587fd3..699bae8971f8 100644 --- a/drivers/net/wireless/marvell/libertas/if_spi.c +++ b/drivers/net/wireless/marvell/libertas/if_spi.c @@ -1153,7 +1153,8 @@ static int if_spi_probe(struct spi_device *spi) priv->fw_ready = 1; /* Initialize interrupt handling stuff. */ - card->workqueue = alloc_workqueue("libertas_spi", WQ_MEM_RECLAIM, 0); + card->workqueue = alloc_workqueue("libertas_spi", + WQ_MEM_RECLAIM | WQ_PERCPU, 0); if (!card->workqueue) { err = -ENOMEM; goto remove_card; diff --git a/drivers/net/wireless/marvell/libertas_tf/main.c b/drivers/net/wireless/marvell/libertas_tf/main.c index d1067874428f..c51091e7c6c6 100644 --- a/drivers/net/wireless/marvell/libertas_tf/main.c +++ b/drivers/net/wireless/marvell/libertas_tf/main.c @@ -708,7 +708,7 @@ EXPORT_SYMBOL_GPL(lbtf_bcn_sent); static int __init lbtf_init_module(void) { lbtf_deb_enter(LBTF_DEB_MAIN); - lbtf_wq = alloc_workqueue("libertastf", WQ_MEM_RECLAIM, 0); + lbtf_wq = alloc_workqueue("libertastf", WQ_MEM_RECLAIM | WQ_PERCPU, 0); if (lbtf_wq == NULL) { printk(KERN_ERR "libertastf: couldn't create workqueue\n"); return -ENOMEM; |