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cgroup.c: remove redundant check for mixable cgroup in cgroup_migrate_vet_dst

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We have:
int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp)
{
...
	/* mixables don't care */
	if (cgroup_is_mixable(dst_cgrp))
		return 0;

	/*
	 * If @dst_cgrp is already or can become a thread root or is
	 * threaded, it doesn't matter.
	 */
	if (cgroup_can_be_thread_root(dst_cgrp) || cgroup_is_threaded(dst_cgrp))
		return 0;
...
}

but in fact the entry of cgroup_can_be_thread_root() covers case that
checking cgroup_is_mixable() as following:
static bool cgroup_can_be_thread_root(struct cgroup *cgrp)
{
        /* mixables don't care */
        if (cgroup_is_mixable(cgrp))
                return true;
...
}

so explicitly checking in cgroup_migrate_vet_dst is unnecessary.

Signed-off-by: Lin Feng <linf@wangsu.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lin Feng 2022-06-21 17:23:58 +08:00 committed by Tejun Heo
parent e210a89f5b
commit d75cd55ae2
1 changed files with 0 additions and 4 deletions
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4
kernel/cgroup/cgroup.c
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@ -2566,10 +2566,6 @@ int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp)
if (!cgroup_is_valid_domain(dst_cgrp->dom_cgrp))
return -EOPNOTSUPP;
/* mixables don't care */
if (cgroup_is_mixable(dst_cgrp))
return 0;
/*
* If @dst_cgrp is already or can become a thread root or is
* threaded, it doesn't matter.