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Message-Id: <20251025064844.495525-3-chenridong@huaweicloud.com> Date: Sat, 25 Oct 2025 06:48:24 +0000 From: Chen Ridong <chenridong@...weicloud.com> To: longman@...hat.com, tj@...nel.org, hannes@...xchg.org, mkoutny@...e.com Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, lujialin4@...wei.com, chenridong@...wei.com Subject: [PATCH RFC v2 02/22] cpuset: add early empty cpumask check in partition_xcpus_add/del From: Chen Ridong <chenridong@...wei.com> Add a check for an empty cpumask at the start of partition_xcpus_add() and partition_xcpus_del(). This allows the functions to return early, avoiding unnecessary computation when there is no work to be done. Signed-off-by: Chen Ridong <chenridong@...wei.com> --- kernel/cgroup/cpuset.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 6af4d80b53c4..3ba9ca4e8f5e 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1345,6 +1345,9 @@ static bool partition_xcpus_add(int new_prs, struct cpuset *parent, WARN_ON_ONCE(new_prs < 0); lockdep_assert_held(&callback_lock); + if (cpumask_empty(xcpus)) + return false; + if (!parent) parent = &top_cpuset; @@ -1377,6 +1380,9 @@ static bool partition_xcpus_del(int old_prs, struct cpuset *parent, WARN_ON_ONCE(old_prs < 0); lockdep_assert_held(&callback_lock); + if (cpumask_empty(xcpus)) + return false; + if (!parent) parent = &top_cpuset; -- 2.34.1
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