From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 01A4C34CFA0; Wed, 5 Nov 2025 21:07:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762376879; cv=none; b=MVPCGXFVE0zq10vZpxWs1yT12OtQABD4iXBaIgkypASFsessQl/rTosQRvk9MRkVE8Ot1y1LouTmXXMY6nFP7nt1X/ovghZ+8GKf8/0Yh7DgtTIP80rFyJOdjPDN9ypfaF5fPXGsdiEbnqBhQIrUPwzeqYmVgQUkUJeHzYNZJmI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762376879; c=relaxed/simple; bh=VBowzwkKI7sQO6hRH/44BMa4PxA99ppD75DvlCpqKuI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DeJD9r66bVYJ4Uv3X/t4ma4JQ36NghiLwHgzBBZ4r+WdnYYYBKySISZuPQ63ZglPg24gCsRRTUNfZmXiOsIRyXgxSeItDToVCodNvEz2AWhYIL+QLaYdXgQimKAc5CJ5sVf43HppNv4Od1XDx4BppU9DHvKpuSH1dTiyKSfNK50= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HCxWOTZX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HCxWOTZX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B1E3C116B1; Wed, 5 Nov 2025 21:07:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762376878; bh=VBowzwkKI7sQO6hRH/44BMa4PxA99ppD75DvlCpqKuI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HCxWOTZXSfmgLOy+8qHyUSsJQbRRrEggtHXYLIpXy1swuMrv2SEYUM8cLQW7kSc4H 0Ka2bto9uN0BXbhyNM3r1gLJVYwW3t2rKAXPeI6d3ZnnTZoRFUTmkBveHxO+F8uRmo AXkHlKN4LkLllSCXYkJiBOKHWrRf6CXXYtYu1l6M03U6EEvLzqrMyOOfnSaNsd0vRj h2TmHpzXfc20tUeNa2fzrHLlFE/ggaDYNk1I4h5CwebPAdOaP0ppHyvo465ef4OXCB CyfaCDTcbrZRKcEQW+8KvinCbmGda/odIiBswEOY/el7rbNcbJ1X/NP4oGu/CK60DH oTdnWeUTkDOGg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Danilo Krummrich , "David S . Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 30/31] kthread: Document kthread_affine_preferred() Date: Wed, 5 Nov 2025 22:03:46 +0100 Message-ID: <20251105210348.35256-31-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251105210348.35256-1-frederic@kernel.org> References: <20251105210348.35256-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The documentation of this new API has been overlooked during its introduction. Fill the gap. Signed-off-by: Frederic Weisbecker --- kernel/kthread.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/kthread.c b/kernel/kthread.c index e38ff9b943cf..4d0d5dccc9d8 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -858,6 +858,18 @@ int kthreadd(void *unused) return 0; } +/** + * kthread_affine_preferred - Define a kthread's preferred affinity + * @p: thread created by kthread_create(). + * @mask: preferred mask of CPUs (might not be online, must be possible) for @p + * to run on. + * + * Similar to kthread_bind_mask() except that the affinity is not a requirement + * but rather a preference that can be constrained by CPU isolation or CPU hotplug. + * Must be called before the first wakeup of the kthread. + * + * Returns 0 if the affinity has been applied. + */ int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask) { struct kthread *kthread = to_kthread(p); -- 2.51.0