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([2601:188:c102:b180:1f8b:71d0:77b1:1f6e]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-56375cd7cd6sm4961512e0c.10.2026.01.11.17.43.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 11 Jan 2026 17:43:30 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: Date: Sun, 11 Jan 2026 20:43:16 -0500 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 12/33] cpuset: Provide lockdep check for cpuset lock held To: Frederic Weisbecker , LKML Cc: =?UTF-8?Q?Michal_Koutn=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 , 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 References: <20260101221359.22298-1-frederic@kernel.org> <20260101221359.22298-13-frederic@kernel.org> Content-Language: en-US In-Reply-To: <20260101221359.22298-13-frederic@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/1/26 5:13 PM, Frederic Weisbecker wrote: > 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) The cgroup/for-next tree already have a similar lockdep_assert_cpuset_lock_held() defined. So you can drop this patch if this series won't land in the next merge window. Cheers, Longman