From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B544BEEEC1C for ; Thu, 1 Jan 2026 22:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ApjPO282eYqEcYcf0OZCGawmv5v67njckKGjdm3x/+U=; b=klgpKc/F7apO/5XA8O3FP3jeek hBCC5WVUK71JAj/6VhmQU1sgk8eU8FNEMn+iMLUc+DJS9NKYX5+0wtPTpgfyrcPwy3Yqiytu1VKEY IigSjRlfBUAeDjBSQFjXanBEMOAGd8BGzKwu2wNL5cB9lSJOtmM34e2neOODVFuI2h/1KNxvINkHN 82jlicdAINETik14cBVBfGo/A1AgP0kqpaaEiQUIYVrigcBuLr92zdI9jbc2l5LvJkourArfsmwIr fTuRwHy4pkUK69scYbsNuB+kYPDVsxTmiTxeDjKapgqW/qzEnd8X3sTGpBZ5EmXwiC2i1QW4qvP4W ae53BGMQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vbQxa-00000007YHA-1Qjh; Thu, 01 Jan 2026 22:15:58 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vbQxV-00000007YCO-2dIj for linux-arm-kernel@lists.infradead.org; Thu, 01 Jan 2026 22:15:53 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 0776C60017; Thu, 1 Jan 2026 22:15:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 012EBC116D0; Thu, 1 Jan 2026 22:15:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767305752; bh=v9YrBjmYoXXJcaUrCVcNEergJy1rpdNBj6w7mIgdodQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SyFLLg0iW6FU1eawRmvnINnCpxzead2omuxl9REafTvn+PFWHvz19FAsri2C1gbYz nmBMznsPhIHNzpbRATsRTyEQmSHDmZRSJpNzzQHYX4BxZkvQqQciqWraphJHo4otMG yKE6X1B02Y0h85ZIcFaIRchoCui9kzgnkUDtVsfAXxYLAi2HJxIA4Yd0JmB+Pqb/vJ KFlIaxmBoJqkoT94z2kMTPUGJ4vpk1jl7UDtwx5C++CbT7Zm18ygJQdm4fRZr6G4CD Tchm5MK1nQsZUtkbmbGbmnfdRBNoOl6ziRKujJrp7iJG93T0zheiYwTQ4Z5PaQM92J 1KWjLLM8diO1w== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , 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 12/33] cpuset: Provide lockdep check for cpuset lock held Date: Thu, 1 Jan 2026 23:13:37 +0100 Message-ID: <20260101221359.22298-13-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org cpuset modifies partitions, including isolated, while holding the cpuset mutex. This means that holding the cpuset mutex is safe to synchronize against housekeeping cpumask changes. Provide a lockdep check to validate that. Signed-off-by: Frederic Weisbecker --- include/linux/cpuset.h | 2 ++ kernel/cgroup/cpuset.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index a98d3330385c..1c49ffd2ca9b 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -18,6 +18,8 @@ #include #include +extern bool lockdep_is_cpuset_held(void); + #ifdef CONFIG_CPUSETS /* diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 3afa72f8d579..5e2e3514c22e 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -283,6 +283,13 @@ void cpuset_full_unlock(void) cpus_read_unlock(); } +#ifdef CONFIG_LOCKDEP +bool lockdep_is_cpuset_held(void) +{ + return lockdep_is_held(&cpuset_mutex); +} +#endif + static DEFINE_SPINLOCK(callback_lock); void cpuset_callback_lock_irq(void) -- 2.51.1