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Message-ID: <aKxrYlx1Rzvp8ebO@localhost.localdomain> Date: Mon, 25 Aug 2025 15:55:46 +0200 From: Frederic Weisbecker <frederic@...nel.org> To: Marco Crivellari <marco.crivellari@...e.com> Cc: linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Michal Hocko <mhocko@...e.com> Subject: Re: [PATCH v2 1/4] Workqueue: replace use of system_wq with system_percpu_wq Le Mon, Aug 25, 2025 at 03:29:03PM +0200, Marco Crivellari a écrit : > 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. > > system_wq is a per-CPU worqueue, yet nothing in its name tells about that > CPU affinity constraint, which is very often not required by users. Make > it clear by adding a system_percpu_wq. > > queue_work() / queue_delayed_work() mod_delayed_work() will now use the > new per-cpu wq: whether the user still stick on the old name a warn will > be printed along a wq redirect to the new one. > > This patch add the new system_percpu_wq except for mm, fs and net > subsystem, whom are handled in separated patches. > > The old wq will be kept for a few release cylces. > > Suggested-by: Tejun Heo <tj@...nel.org> > Signed-off-by: Marco Crivellari <marco.crivellari@...e.com> > --- > arch/s390/kernel/diag/diag324.c | 4 ++-- > arch/s390/kernel/hiperdispatch.c | 2 +- > drivers/accel/ivpu/ivpu_hw_btrs.c | 2 +- > drivers/accel/ivpu/ivpu_ipc.c | 2 +- > drivers/accel/ivpu/ivpu_job.c | 2 +- > drivers/accel/ivpu/ivpu_mmu.c | 2 +- > drivers/accel/ivpu/ivpu_pm.c | 2 +- > drivers/acpi/osl.c | 2 +- > drivers/base/devcoredump.c | 2 +- > drivers/block/nbd.c | 2 +- > drivers/block/sunvdc.c | 2 +- > drivers/cxl/pci.c | 2 +- > drivers/extcon/extcon-intel-int3496.c | 4 ++-- > drivers/gpio/gpiolib-cdev.c | 4 ++-- > drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++-- > drivers/gpu/drm/bridge/ite-it6505.c | 2 +- > drivers/gpu/drm/bridge/ti-tfp410.c | 2 +- > drivers/gpu/drm/drm_probe_helper.c | 2 +- > drivers/gpu/drm/drm_self_refresh_helper.c | 2 +- > drivers/gpu/drm/exynos/exynos_hdmi.c | 2 +- > drivers/gpu/drm/i915/i915_driver.c | 2 +- > drivers/gpu/drm/i915/i915_drv.h | 2 +- > .../gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 4 ++-- > drivers/gpu/drm/scheduler/sched_main.c | 2 +- > drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 2 +- > drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++-- > drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 6 ++--- > drivers/gpu/drm/xe/xe_pt.c | 2 +- > drivers/iio/adc/pac1934.c | 2 +- > drivers/input/keyboard/gpio_keys.c | 2 +- > drivers/input/misc/palmas-pwrbutton.c | 2 +- > drivers/input/mouse/synaptics_i2c.c | 8 +++---- > drivers/leds/trigger/ledtrig-input-events.c | 2 +- > drivers/md/bcache/super.c | 20 ++++++++--------- > drivers/mmc/host/mtk-sd.c | 4 ++-- > drivers/net/ethernet/sfc/efx_channels.c | 2 +- > drivers/net/ethernet/sfc/siena/efx_channels.c | 2 +- > drivers/net/phy/sfp.c | 12 +++++----- > drivers/net/wireless/intel/ipw2x00/ipw2100.c | 6 ++--- > drivers/net/wireless/intel/ipw2x00/ipw2200.c | 2 +- > drivers/net/wireless/intel/iwlwifi/mvm/tdls.c | 6 ++--- > .../net/wireless/mediatek/mt76/mt7921/init.c | 2 +- > .../net/wireless/mediatek/mt76/mt7925/init.c | 2 +- > drivers/nvdimm/security.c | 4 ++-- > drivers/nvme/target/admin-cmd.c | 2 +- > drivers/nvme/target/fabrics-cmd-auth.c | 2 +- > drivers/pci/endpoint/pci-ep-cfs.c | 2 +- > drivers/phy/allwinner/phy-sun4i-usb.c | 14 ++++++------ > .../platform/cznic/turris-omnia-mcu-gpio.c | 2 +- > .../surface/aggregator/ssh_packet_layer.c | 2 +- > .../surface/aggregator/ssh_request_layer.c | 2 +- > drivers/platform/x86/gpd-pocket-fan.c | 4 ++-- > .../x86/x86-android-tablets/vexia_atla10_ec.c | 2 +- > drivers/power/supply/bq2415x_charger.c | 2 +- > drivers/power/supply/bq24190_charger.c | 2 +- > drivers/power/supply/bq27xxx_battery.c | 6 ++--- > drivers/power/supply/rk817_charger.c | 6 ++--- > drivers/power/supply/ucs1002_power.c | 2 +- > drivers/power/supply/ug3105_battery.c | 6 ++--- > drivers/ras/cec.c | 2 +- > drivers/regulator/irq_helpers.c | 2 +- > drivers/regulator/qcom-labibb-regulator.c | 4 ++-- > drivers/thunderbolt/tb.c | 2 +- > drivers/usb/dwc3/gadget.c | 2 +- > drivers/usb/host/xhci-dbgcap.c | 8 +++---- > drivers/usb/host/xhci-ring.c | 2 +- > drivers/xen/events/events_base.c | 6 ++--- > include/drm/gpu_scheduler.h | 2 +- > include/linux/closure.h | 2 +- > include/linux/workqueue.h | 22 +++++++++---------- > io_uring/io_uring.c | 2 +- > kernel/bpf/cgroup.c | 2 +- > kernel/bpf/cpumap.c | 2 +- > kernel/cgroup/cgroup.c | 2 +- > kernel/module/dups.c | 4 ++-- > kernel/rcu/tasks.h | 4 ++-- > kernel/smp.c | 2 +- > kernel/trace/trace_events_user.c | 2 +- > kernel/workqueue.c | 2 +- > rust/kernel/workqueue.rs | 6 ++--- > sound/soc/codecs/aw88081.c | 2 +- > sound/soc/codecs/aw88166.c | 2 +- > sound/soc/codecs/aw88261.c | 2 +- > sound/soc/codecs/aw88395/aw88395.c | 2 +- > sound/soc/codecs/aw88399.c | 2 +- > sound/soc/codecs/cs42l43-jack.c | 6 ++--- > sound/soc/codecs/cs42l43.c | 4 ++-- > sound/soc/codecs/es8326.c | 12 +++++----- > sound/soc/codecs/rt5663.c | 6 ++--- > sound/soc/intel/boards/sof_es8336.c | 2 +- > sound/soc/sof/intel/cnl.c | 2 +- > sound/soc/sof/intel/hda-ipc.c | 2 +- Similar cut needed here. Thanks. -- Frederic Weisbecker SUSE Labs
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