wifi: libertas: add WQ_UNBOUND to alloc_workqueue users

Currently if a user enqueues a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() uses
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 consistency 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.

Explicitly add the WQ_UNBOUND flag to alloc_workqueue() users, marking
the workqueue unbound.

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.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Link: https://patch.msgid.link/20250923145905.327269-2-marco.crivellari@suse.com
[use imperative voice in subject, fix typos]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/marvell/libertas/if_sdio.c b/drivers/net/wireless/marvell/libertas/if_sdio.c
index 524034699972df8c90ba193407733023a43831af..fc531803582220706bbb12f22c7caa8e134a2957 100644 (file)
--- 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_UNBOUND, 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 b722a6587fd3de8b6375df03dce9734ecc519ceb..8a2504a62840971a3de98e0a67fff006bcc81a2e 100644 (file)
--- 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_UNBOUND, 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 d1067874428f4629c289c7a473f25a6d30577aaa..fb20fe31cd363bf250b1bd1124bd646e6a5f4d7a 100644 (file)
--- 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_UNBOUND, 0);
        if (lbtf_wq == NULL) {
                printk(KERN_ERR "libertastf: couldn't create workqueue\n");
                return -ENOMEM;