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 771ABCCD183 for ; Mon, 13 Oct 2025 20:33:35 +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=bRoWUlFhAwhp2cFv9PQzQntX9r9EON1eUpq3Tj44Lhk=; b=M4PDLyNokSGCt6urJwqUKJG4an WS7d8ZN4x8mWlpHVDPvMoP+CLlTFQhwRGh+eLz6CSVhSVn2LaEXHtAXl0yPguu3HI9Dgrv32/Rwiq atuedJswRd+PXEM8ENcUp1qwL2Px4u7V6+K3xWAIiOcM11hWV5h6vht3h6w3Yglvb8frD08Yj2AVF 4MKrFspYxOjXmBcOHbavUK9TAWyAdx3T9FlRAqIrmLD83ulaMXSGRgbtyPgVk0OJqi3iFBiM7JsoO lBMyJVzcuhUxOTE2GpqxYKvqEF7JTvRPiooFUHufdXFiZt+J+IB7v+KC2dcTzCvKts/wdpyB+r2o7 oieMyPpw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PEX-0000000ENsg-12xa; Mon, 13 Oct 2025 20:33:29 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PEU-0000000ENod-0CCo for linux-arm-kernel@lists.infradead.org; Mon, 13 Oct 2025 20:33:27 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id A5FDB48BA6; Mon, 13 Oct 2025 20:33:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9228C4CEF8; Mon, 13 Oct 2025 20:33:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760387605; bh=VdxniS9PgPy7NwhH2qd2yJdMmQz1qplz7zrJIak9Kiw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OYkHhfUXI/oYa4SUYC3drRS/xQcuPGvoJ7NPAlL+RYkd7LDKQhVy66GIv8GRNnfq1 vta4/PExq+fjEPabx2OflvbpD8ELoJfqDDnIQfTM11ITuobQsbRQNXofNlQKL61YhW x/NThH0eYDAZ9ccNisPSMap9HlbAI08z9DDWViQ3Lk5zSF3JuRqgNhutW4TnyAJ8jv Nf59vwv9i4Rvsim9ENbglJi+KEKcK8aPqG1Zxpcx5Z/h8MD+MSx2OCYq64txa1+r7L MiEYtaDzQewyIhShh6A2JbjtLxzvRTq4ZVb5PTnXWtdVlTZLWCINQsN5Q3TdoH9Nnp ucj4kQYQMMMCQ== 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 11/33] cpuset: Provide lockdep check for cpuset lock held Date: Mon, 13 Oct 2025 22:31:24 +0200 Message-ID: <20251013203146.10162-12-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251013_133326_115434_4F1435C5 X-CRM114-Status: GOOD ( 10.42 ) 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 2ddb256187b5..051d36fec578 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 8595f1eadf23..aa1ac7bcf2ea 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -279,6 +279,13 @@ 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) -- 2.51.0