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 C04F8346E44; Wed, 24 Dec 2025 13:47:15 +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=1766584035; cv=none; b=qLIC5V45FceCSUpHswR0sWy21JuiqWXaxl2Ys5XJq6C92fL91ukDdgR3BvzMZUR4CMJeryCtXGR4teDEGg8Wke90Ps6B0lnZISCSUF52vzRVnnbe+KO44FA3zBH7j/eHd2QdIfyLGgGc2S1W9C3b9IgKEX8vFtYXhFR6LfyM8dQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766584035; c=relaxed/simple; bh=v9YrBjmYoXXJcaUrCVcNEergJy1rpdNBj6w7mIgdodQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eyHR+cDs1wkjeLLqzB6s5PAYBLxxVqts+jG7FV1B0chSikfJYl5z1lwwLjD52ndnvc0//fKRXfYLQh29dtUzY8s4VUoYsUX5ELuMKHHDDJHojNP2N4gOSh3aU8Ikg94ktoveJwauYLBCIgoyW+bZqtS84ztQ5QWzbQFOsE4wmn0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rCRujogT; 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="rCRujogT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62463C2BC87; Wed, 24 Dec 2025 13:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766584035; bh=v9YrBjmYoXXJcaUrCVcNEergJy1rpdNBj6w7mIgdodQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rCRujogTY+v2D7yNqeA2I4GHSEB5IZ6gjsFGX3G5TJYOT0Mj3Q+Sv7+IKEY0+THzu 7igwa4gdL1xbO5MZz7u8limrG0g71QKHp8uIT8ZKC6DpAC0YOAnM5rFSu74DOYB1Z4 HWuzWKNk7uy1AFlVxMxxei5I5tZizBny1roqv6wsvmjcVEk7JfGl8keToChYW3XFhu EQiCKpdu5d0aTnR/goCjhSqylvapGUC/fA/wVCXQa8/N83XqgTKj+ec7CKs7WZPg/6 GEg080xTpmoiZRH46UkLLvxB1SXoNxoC/21yOxb0ZK1gAG5CVY8JwfPnOmEfoRaEyU SdcaeUqbrgKcQ== 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: Wed, 24 Dec 2025 14:44:59 +0100 Message-ID: <20251224134520.33231-13-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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