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 patch adds 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 Signed-off-by: Marco Crivellari --- drivers/net/wireless/ath/ath6kl/usb.c | 2 +- drivers/net/wireless/quantenna/qtnfmac/core.c | 3 ++- drivers/net/wireless/realtek/rtlwifi/base.c | 2 +- drivers/net/wireless/realtek/rtw88/usb.c | 3 ++- drivers/net/wireless/silabs/wfx/main.c | 2 +- drivers/net/wireless/st/cw1200/bh.c | 4 ++-- 6 files changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c index 38bb501fc553..bfb21725d779 100644 --- a/drivers/net/wireless/ath/ath6kl/usb.c +++ b/drivers/net/wireless/ath/ath6kl/usb.c @@ -637,7 +637,7 @@ static struct ath6kl_usb *ath6kl_usb_create(struct usb_interface *interface) ar_usb = kzalloc(sizeof(struct ath6kl_usb), GFP_KERNEL); if (ar_usb == NULL) return NULL; - ar_usb->wq = alloc_workqueue("ath6kl_wq", 0, 0); + ar_usb->wq = alloc_workqueue("ath6kl_wq", WQ_PERCPU, 0); if (!ar_usb->wq) { kfree(ar_usb); return NULL; diff --git a/drivers/net/wireless/quantenna/qtnfmac/core.c b/drivers/net/wireless/quantenna/qtnfmac/core.c index 825b05dd3271..38af6cdc2843 100644 --- a/drivers/net/wireless/quantenna/qtnfmac/core.c +++ b/drivers/net/wireless/quantenna/qtnfmac/core.c @@ -714,7 +714,8 @@ int qtnf_core_attach(struct qtnf_bus *bus) goto error; } - bus->hprio_workqueue = alloc_workqueue("QTNF_HPRI", WQ_HIGHPRI, 0); + bus->hprio_workqueue = alloc_workqueue("QTNF_HPRI", + WQ_HIGHPRI | WQ_PERCPU, 0); if (!bus->hprio_workqueue) { pr_err("failed to alloc high prio workqueue\n"); ret = -ENOMEM; diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c index e26feb8de658..2786e4ee67eb 100644 --- a/drivers/net/wireless/realtek/rtlwifi/base.c +++ b/drivers/net/wireless/realtek/rtlwifi/base.c @@ -445,7 +445,7 @@ static int _rtl_init_deferred_work(struct ieee80211_hw *hw) struct rtl_priv *rtlpriv = rtl_priv(hw); struct workqueue_struct *wq; - wq = alloc_workqueue("%s", 0, 0, rtlpriv->cfg->name); + wq = alloc_workqueue("%s", WQ_PERCPU, 0, rtlpriv->cfg->name); if (!wq) return -ENOMEM; diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c index 3b5126ffc81a..db60e142268d 100644 --- a/drivers/net/wireless/realtek/rtw88/usb.c +++ b/drivers/net/wireless/realtek/rtw88/usb.c @@ -965,7 +965,8 @@ static int rtw_usb_init_rx(struct rtw_dev *rtwdev) struct sk_buff *rx_skb; int i; - rtwusb->rxwq = alloc_workqueue("rtw88_usb: rx wq", WQ_BH, 0); + rtwusb->rxwq = alloc_workqueue("rtw88_usb: rx wq", WQ_BH | WQ_PERCPU, + 0); if (!rtwusb->rxwq) { rtw_err(rtwdev, "failed to create RX work queue\n"); return -ENOMEM; diff --git a/drivers/net/wireless/silabs/wfx/main.c b/drivers/net/wireless/silabs/wfx/main.c index a61128debbad..dda36e41eed1 100644 --- a/drivers/net/wireless/silabs/wfx/main.c +++ b/drivers/net/wireless/silabs/wfx/main.c @@ -364,7 +364,7 @@ int wfx_probe(struct wfx_dev *wdev) wdev->pdata.gpio_wakeup = NULL; wdev->poll_irq = true; - wdev->bh_wq = alloc_workqueue("wfx_bh_wq", WQ_HIGHPRI, 0); + wdev->bh_wq = alloc_workqueue("wfx_bh_wq", WQ_HIGHPRI | WQ_PERCPU, 0); if (!wdev->bh_wq) return -ENOMEM; diff --git a/drivers/net/wireless/st/cw1200/bh.c b/drivers/net/wireless/st/cw1200/bh.c index 3b4ded2ac801..3f07f4e1deee 100644 --- a/drivers/net/wireless/st/cw1200/bh.c +++ b/drivers/net/wireless/st/cw1200/bh.c @@ -54,8 +54,8 @@ int cw1200_register_bh(struct cw1200_common *priv) int err = 0; /* Realtime workqueue */ priv->bh_workqueue = alloc_workqueue("cw1200_bh", - WQ_MEM_RECLAIM | WQ_HIGHPRI - | WQ_CPU_INTENSIVE, 1); + WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_PERCPU, + 1); if (!priv->bh_workqueue) return -ENOMEM; -- 2.51.0