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cpuset: remove redundant special case for null input in node mask update

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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@huawei.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Ridong 2025-09-22 13:02:31 +00:00 committed by Tejun Heo
parent 51840f7ba3
commit b72af996b6
1 changed files with 8 additions and 14 deletions
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22
kernel/cgroup/cpuset.c
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@ -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)) {