From nobody Sun Feb 8 21:46:46 2026 Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (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 BC4D230F7F7 for ; Fri, 24 Oct 2025 10:19:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761301161; cv=none; b=b2w1g/UCDdnICX1SFuFO1/jtqHu/gY1Anrj0boVqD2JV6BGdb9oNdG27R+cTzBSE2gAXkQH9H0OWVDA2abEG6RddnXaeWFhjXa6/DR27X9Z1kzps7qOwetqXINnsbC1hVrHbRX31ihIU1ORy9mEQSGV8LUMoAQQWjRqr/NkQABo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761301161; c=relaxed/simple; bh=Lkciv/B8ZAuPwj+weT53Weglv8lWUyMUl2v4l/65Kp8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rCp3EVNG8PCOejEiZ1ZNfI9dBes2g/V0nkKX/GvCy+yOngq76HLXyXcuAoJGyPdeKHpWbO7lUB+m57ayb/nwnBcsRM6wwUDn+vBm/IvJq2XIfW8fXof4/XesV6C8DEV/+MgF2CZL3kYtJQ0cwf8C835/DQVsaEN2HEFGWqlx/hU= 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=DBInBZjj; arc=none smtp.client-ip=209.85.221.51 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="DBInBZjj" Received: by mail-wr1-f51.google.com with SMTP id ffacd0b85a97d-3ece0e4c5faso1653166f8f.1 for ; Fri, 24 Oct 2025 03:19:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1761301158; x=1761905958; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Ugmv/FKfXXvgUX6AmhpENgX/uhCwrr+UISxTLvtIUjk=; b=DBInBZjjHqfFjBpjORraOKH7xmhpxzjlDEhgTNjUP9Joy2pqlMagpXj6zjgxiDyv40 Um0fbHLu4quY/OWW564vnrBz1iBXah2Vrp2lJUmrgKfnNEv9gmBrG39dWee/eRuACyBt arC4MJ/FMrhkluOeA3CSpYMboy9UpX8zLQBLP7hk4iB1b/X9xlObxBnWZLgWcAzkScQ2 YgTt22i9SIZT/yb/SfTGoO3baEIBqQAGKXhnv7nh/+AlGsnVp+5xVcJDizfTZ6r3olHi fzBMHcU/yJXVZTQCrCwDtHiTHNlFrEPzfHicEdHlHUGMuZRJu9dedQQRlewwFBYCKGAu CjOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761301158; x=1761905958; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Ugmv/FKfXXvgUX6AmhpENgX/uhCwrr+UISxTLvtIUjk=; b=Z8/8np9KZFzwQeCVXwhUt/rvRIcvabyE1C3fyQdFF5b8Eo/KtoSuYg75EvLIz4cPHj 4ih8aGfqmMZKXKIZiMG/ahMfbaQE5FR8fJmh1KFHpuWwm+GSLkStLX9HMbEhXQRmxEmS pVA8+YwxxVRMzGJb+9s0ljtTWMOsWSpJcUMAOaGr4tJ61DXZF28g5HEnuKhmJgNTzkgC fHXyGiEi3l1p5aS9Zq5uq+0+B0lu7+36ayR7plT9xPsXJzeu/oa8dqzHB4qpDvTLLqCd xjClt1ZcC/4uLPHpBUO5+Z8gq6WbiqiEgemvY/dCjB13P2eB15CxlL5dmtw5w7M9af6/ f/Rg== X-Gm-Message-State: AOJu0YwvXdg1Z5E17P0Uw6FsjZQ6iLb0ooJWVyLsI0/uVeLsDbOcpTOw AjQEAL0q+S2CxXrzJSEXcBbXXVHMaYu2j0YtZLa9p7XEYMh8ACNz4FCLsDTsDtm4tpsr72ZxE9k Sf+ts X-Gm-Gg: ASbGncv+tZLphSygmvTEc7iF57NFfU88bjYE5O4y/aBzuTbkb3DvVJ2/UsM1P3f69P0 scYqUlmKXr14TgN1fG7sYy/ohsGdsVd45rrwObzFp7K8nDbskgSy4tW+e2/2UQCEEYhsBmnoUGW UlsJ3B+volqjPvGTsHCidUkhU2vHTVXnR+f/VvX1QLQPW4ym+fwFBHE6W8bMu5woYWopN4LDJ18 CPaPGIF8yr5KRuyaeTpFG19jbXAyOups6c18nrWMMTMCloLX2Wh8qMWTl1/EEHCMgcER38Cznpx Y6lVdjPpGrMzQdnVRszTIMwQXCG9K3nv7gwLhQ8gIGzKyfKmVJbAg/j6vF57uG+uXz7QmR4sA0l pOnialjrPtfN5qVLDaPL2TQM+a/z5fTSBWA4LfmkdakpYj35y02Fgiq4n+G0i/LOqp2Ujpo5eTV zPMeduNdRQ/xjH2eFcdGawtkJu X-Google-Smtp-Source: AGHT+IFo1e+SSCggqmiz/ZwTZcTSQJ36JzYF2JuARwEm9Wcb6K0n6uFSgCDD08HQuxUjSN8NRQwDqg== X-Received: by 2002:a05:6000:40dd:b0:428:52d1:73ab with SMTP id ffacd0b85a97d-42852d17555mr8174618f8f.58.1761301157812; Fri, 24 Oct 2025 03:19:17 -0700 (PDT) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429897f52aasm8372695f8f.12.2025.10.24.03.19.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Oct 2025 03:19:17 -0700 (PDT) From: Marco Crivellari To: linux-kernel@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Greg Kroah-Hartman , "Rafael J . Wysocki" , Danilo Krummrich Subject: [PATCH 1/3] driver core: replace use of system_unbound_wq with system_dfl_wq Date: Fri, 24 Oct 2025 12:19:02 +0200 Message-ID: <20251024101904.146351-2-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251024101904.146351-1-marco.crivellari@suse.com> References: <20251024101904.146351-1-marco.crivellari@suse.com> 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. system_unbound_wq should be the default workqueue so as not to enforce locality constraints for random work whenever it's not required. Adding system_dfl_wq to encourage its use when unbound work should be used. The old system_unbound_wq will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- drivers/base/dd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 13ab98e033ea..4938a132a085 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -193,7 +193,7 @@ void driver_deferred_probe_trigger(void) * Kick the re-probe thread. It may already be scheduled, but it is * safe to kick it again. */ - queue_work(system_unbound_wq, &deferred_probe_work); + queue_work(system_dfl_wq, &deferred_probe_work); } =20 /** --=20 2.51.0