linux-kernel - [PATCH v12 07/10] cgroup/cpuset: Relocate a code block in validate

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Date:   Thu,  1 Sep 2022 16:57:42 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Phil Auld <pauld@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Michal Koutný <mkoutny@...e.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v12 07/10] cgroup/cpuset: Relocate a code block in validate_change()

This patch moves down the exclusive cpu and memory check in
validate_change(). There is no functional change.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 kernel/cgroup/cpuset.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 15fcd2f86108..b0d921d03f62 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -741,22 +741,6 @@ static int validate_change(struct cpuset *cur, struct cpuset *trial)
 
 	par = parent_cs(cur);
 
-	/*
-	 * If either I or some sibling (!= me) is exclusive, we can't
-	 * overlap
-	 */
-	ret = -EINVAL;
-	cpuset_for_each_child(c, css, par) {
-		if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) &&
-		    c != cur &&
-		    cpumask_intersects(trial->cpus_allowed, c->cpus_allowed))
-			goto out;
-		if ((is_mem_exclusive(trial) || is_mem_exclusive(c)) &&
-		    c != cur &&
-		    nodes_intersects(trial->mems_allowed, c->mems_allowed))
-			goto out;
-	}
-
 	/*
 	 * Cpusets with tasks - existing or newly being attached - can't
 	 * be changed to have empty cpus_allowed or mems_allowed.
@@ -781,6 +765,22 @@ static int validate_change(struct cpuset *cur, struct cpuset *trial)
 				       trial->cpus_allowed))
 		goto out;
 
+	/*
+	 * If either I or some sibling (!= me) is exclusive, we can't
+	 * overlap
+	 */
+	ret = -EINVAL;
+	cpuset_for_each_child(c, css, par) {
+		if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) &&
+		    c != cur &&
+		    cpumask_intersects(trial->cpus_allowed, c->cpus_allowed))
+			goto out;
+		if ((is_mem_exclusive(trial) || is_mem_exclusive(c)) &&
+		    c != cur &&
+		    nodes_intersects(trial->mems_allowed, c->mems_allowed))
+			goto out;
+	}
+
 	ret = 0;
 out:
 	rcu_read_unlock();
-- 
2.31.1