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 0E28B2F7AD2; Thu, 1 Jan 2026 22:15:53 +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=1767305753; cv=none; b=GEMKjKeH/WTXS4gulkZVTMUcVcZhh2j8AaYzfMhB9yQZAn04irTFsZkJ0Gu21r+SBwpcqoKhS9kCFo90F+3P+/6pYZhxnQO7t43qnE6z0ADCy9ObsHr1QYo3Hi466WZiQ7RhLD5U2xXhqBat8a0Bc4ohLb3s01hTpRbVchmCBKA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767305753; c=relaxed/simple; bh=v9YrBjmYoXXJcaUrCVcNEergJy1rpdNBj6w7mIgdodQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JDQt14zvqslTqdnhaMHEETA0EUVcT86dxy54c3LFGsM87BmkVUdw44nl3b+DB4HzqWXt9A+mpoa8ieveHLOVR9lRVSCy9+e54V7ujcPKz2pJwjk1RbKkCGAwJvPZHGmjJ2c0CCIb4On/cjHVTTUvEXso76OA7VfwlaeCPbn6c20= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SyFLLg0i; 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="SyFLLg0i" 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> 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