linux-kernel - [PATCH -next 1/3] cpuset: remove redundant special case for null input in node mask update

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Message-Id: <20250922130233.3237521-2-chenridong@huaweicloud.com>
Date: Mon, 22 Sep 2025 13:02:31 +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 -next 1/3] cpuset: remove redundant special case for null input in node mask update

From: Chen Ridong <chenridong@...wei.com>

The nodelist_parse function already handles empty nodemask input
appropriately, making it unnecessary to handle this case separately
during the node mask update process.

Signed-off-by: Chen Ridong <chenridong@...wei.com>
---
 kernel/cgroup/cpuset.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 535174ed7126..20dface3c3e0 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2847,22 +2847,16 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
 
 	/*
 	 * An empty mems_allowed is ok iff there are no tasks in the cpuset.
-	 * Since nodelist_parse() fails on an empty mask, we special case
-	 * that parsing.  The validate_change() call ensures that cpusets
-	 * with tasks have memory.
+	 * The validate_change() call ensures that cpusets with tasks have memory.
 	 */
-	if (!*buf) {
-		nodes_clear(trialcs->mems_allowed);
-	} else {
-		retval = nodelist_parse(buf, trialcs->mems_allowed);
-		if (retval < 0)
-			goto done;
+	retval = nodelist_parse(buf, trialcs->mems_allowed);
+	if (retval < 0)
+		goto done;
 
-		if (!nodes_subset(trialcs->mems_allowed,
-				  top_cpuset.mems_allowed)) {
-			retval = -EINVAL;
-			goto done;
-		}
+	if (!nodes_subset(trialcs->mems_allowed,
+			  top_cpuset.mems_allowed)) {
+		retval = -EINVAL;
+		goto done;
 	}
 
 	if (nodes_equal(cs->mems_allowed, trialcs->mems_allowed)) {
-- 
2.34.1