From nobody Fri Dec 19 09:35:34 2025 Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C6CD319F40A for ; Tue, 4 Nov 2025 10:54:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762253701; cv=none; b=GUbGT4TBrXRCXDukMBdtQjhY/3G5815b+PUoXE2I8oVz9ox184QGNkwPjqoF5n/AV8phavF1Z29KVl69w7jCKow5r+4OazUqT5joAG2zpividOtgj7JsFH6c8YtUVC4nj+35btXULeLQFDpxhCHT+DyqS7u0MsIu7RROwgKDJWM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762253701; c=relaxed/simple; bh=R1jeV3wiv8DXKujJVS3YRokbucemxRcp2L9aU/+ZO2A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uTN6kukXe+xzt7r4NFdAed/A4wnjMlbWpBqers1DgVFm/jUgr3FXeXH5u06tZSXu3duMu7bZfw6nQY6bYEzvpkl5bvEmEhvpY58gbCO91h4rUCsWLa0gtoFkISLNnALCRTU3ldIEhx5NfB7Wb7t9e2s5Q+8RI4NAoKDKZO/XM5s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=KgD/oN9w; arc=none smtp.client-ip=209.85.218.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="KgD/oN9w" Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-b3b27b50090so832062566b.0 for ; Tue, 04 Nov 2025 02:54:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1762253698; x=1762858498; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=h68+BzrgDoWnKcF5o/ojKkTPKX3UizaTNvfX1EgB8Ec=; b=KgD/oN9wnLB688glrZk0raXjwK+UyQBMBVNFeNjb1sg2zB7iVlEe5UafQ5Gbi0lNCk OE+Bxfa2l9XjZ2ayQBe3LZZFrOggrMJ4pSVGB3OeyYlWEd8fmIeAS5Drup+YLWB22T53 GQbA5E09/Emi8980QyyeGv8ahduJwEykJxYEUAQX14FzH0x5le5JfOkqreE/QOLGu0r3 kgMJyOK2iGdmcw/MQsOfR/99OXElPDDUlNt3kpGg1iEiwiReG+uj17aDGywz6ooh8sJy UNUcr3ihLg0jrX80lhDt1Lahkc/+w6nigZi0fTCZ84NoxqqcXLVqGYD+pvXTtE+sldwx Bu1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762253698; x=1762858498; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=h68+BzrgDoWnKcF5o/ojKkTPKX3UizaTNvfX1EgB8Ec=; b=HRsZzo6AD4mdxVtVS46iD2uC5rKwXZPgfEVq4FVmNxIg3wyNl0cFT3VkNvQm3lKQOL sm1ew5JGGExP9HHAgs3rkPfLCpMsYHWT8E7FGm4lvK6Cnqzwb/q8RTVS7544mzIIBW0E fqKjshesKAKImZaZT2a5q2vz2WmbSHZLsB6mLbr8r5IWxEo9Ska32/LX9h2Iawz88Bts Ku0B5LH7cmkud5y2k73DFMr2PD5CxLAHBPmCN3RCBgfbAVrij5POggyCJuEiqtrFW2ze REieuH3y25ietxpQYxWj5dkNQ0a/30X6KtV/bE0iY0gT6sELGXTk+UWLIRD6cz1vY9o/ vdvw== X-Gm-Message-State: AOJu0Yxvi+hOa++H3udgXdE+2ixTTFoz/ixjKhiorvZGk/abpPXyDNLc BTjbnUZxIYfGToMR4tqOPeFbbXBTtty0ArXT0JaLrq5AO+HeK9X7U5fzzocsJ73wkwcVtYrMKmc nTN0e X-Gm-Gg: ASbGncvA/XCDtliETfzEt/OgQTNbVRXWXK87pmrHtb53vZtgL/Q8xDKMjeOatsnZ/nB PmIHTmWptgVdo2qPLzsWZko8mZ3R5tQHz4Z4MF5sBcKiwS9is2yzHSIEQPwpMiC24+2i8jpdeYU jFexXMu4cUKEjR6Sr/zQX2DziUsGsUbNt//Q77L4WM5+OBnkY1cXwv8wEVYbiG846qauRF6wd79 l1hXdKnC4eQ5ronYVM1ccfND0Gpmj4mSaiEC0BqCn+UlHE1XdTJ77ggAhXIGrax24vO2ZieJFu1 2xAdJGHMfQhVE3JEDTa23PabrAis3OT6zfKFvDUTV8dCh3BljRuyAHO1UNnaGnmDptILyHFcBcU kwYTfNfsYwTPiWr8uEhpkFHPiVZ2/zvMOTL6vh00SD1MizPRjbTDQJv712HRllu7Dw1mo9sUdEC 5uvxU30Zy1rGtLGA== X-Google-Smtp-Source: AGHT+IHfPN6V1Gb0/vnW2BNSqlXyl8GiEmiehj7J7xXiDDPdmxVdlwQ2TmXH/z4ECTJFaHlBm/ipbw== X-Received: by 2002:a17:907:7256:b0:b72:5983:db20 with SMTP id a640c23a62f3a-b725983dfdamr87995466b.32.1762253698012; Tue, 04 Nov 2025 02:54:58 -0800 (PST) Received: from linux ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b723d3a3d4asm180927566b.2.2025.11.04.02.54.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Nov 2025 02:54:57 -0800 (PST) From: Marco Crivellari To: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Greg Kroah-Hartman , Jiri Slaby Subject: [PATCH] tty: replace use of system_unbound_wq with system_dfl_wq Date: Tue, 4 Nov 2025 11:54:46 +0100 Message-ID: <20251104105446.110884-1-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. This patch continues the effort to refactor worqueue APIs, which has begun with the change introducing new workqueues and a new alloc_workqueue flag: commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq") commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag") system_dfl_wq should be the default workqueue so as not to enforce locality constraints for random work whenever it's not required. The old system_unbound_wq will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- drivers/tty/serial/8250/8250_dw.c | 4 ++-- drivers/tty/tty_buffer.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/82= 50_dw.c index 710ae4d40aec..27af83f0ff46 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -361,7 +361,7 @@ static int dw8250_clk_notifier_cb(struct notifier_block= *nb, * deferred event handling complication. */ if (event =3D=3D POST_RATE_CHANGE) { - queue_work(system_unbound_wq, &d->clk_work); + queue_work(system_dfl_wq, &d->clk_work); return NOTIFY_OK; } =20 @@ -680,7 +680,7 @@ static int dw8250_probe(struct platform_device *pdev) err =3D clk_notifier_register(data->clk, &data->clk_notifier); if (err) return dev_err_probe(dev, err, "Failed to set the clock notifier\n"); - queue_work(system_unbound_wq, &data->clk_work); + queue_work(system_dfl_wq, &data->clk_work); } =20 platform_set_drvdata(pdev, data); diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 67271fc0b223..1a5673acd9b1 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -76,7 +76,7 @@ void tty_buffer_unlock_exclusive(struct tty_port *port) mutex_unlock(&buf->lock); =20 if (restart) - queue_work(system_unbound_wq, &buf->work); + queue_work(system_dfl_wq, &buf->work); } EXPORT_SYMBOL_GPL(tty_buffer_unlock_exclusive); =20 @@ -530,7 +530,7 @@ void tty_flip_buffer_push(struct tty_port *port) struct tty_bufhead *buf =3D &port->buf; =20 tty_flip_buffer_commit(buf->tail); - queue_work(system_unbound_wq, &buf->work); + queue_work(system_dfl_wq, &buf->work); } EXPORT_SYMBOL(tty_flip_buffer_push); =20 @@ -560,7 +560,7 @@ int tty_insert_flip_string_and_push_buffer(struct tty_p= ort *port, tty_flip_buffer_commit(buf->tail); spin_unlock_irqrestore(&port->lock, flags); =20 - queue_work(system_unbound_wq, &buf->work); + queue_work(system_dfl_wq, &buf->work); =20 return size; } @@ -613,7 +613,7 @@ void tty_buffer_set_lock_subclass(struct tty_port *port) =20 bool tty_buffer_restart_work(struct tty_port *port) { - return queue_work(system_unbound_wq, &port->buf.work); + return queue_work(system_dfl_wq, &port->buf.work); } =20 bool tty_buffer_cancel_work(struct tty_port *port) --=20 2.51.1