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| author | Tejun Heo <tj@kernel.org> | 2016-02-23 16:00:51 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-02-23 16:00:51 +0100 |
| commit | 62716ea0f2ea4253984008fd4a96a532674ac58f (patch) | |
| tree | c3bbb24ec9952ac9c549b798c3394de3a7c4a246 /kernel/cgroup.c | |
| parent | cgroup: make css_tryget_online_from_dir() also recognize cgroup2 fs (diff) | |
| download | linux-62716ea0f2ea4253984008fd4a96a532674ac58f.tar.xz linux-62716ea0f2ea4253984008fd4a96a532674ac58f.zip | |
cgroup: use ->subtree_control when testing no internal process rule
No internal process rule is enforced by cgroup_migrate_prepare_dst()
during process migration. It tests whether the target cgroup's
->child_subsys_mask is zero which is different from "subtree_control"
write path which tests ->subtree_control. This hasn't mattered
because up until now, both ->child_subsys_mask and ->subtree_control
are zero or non-zero at the same time. However, with the planned
addition of implicit controllers, this will no longer be true.
This patch prepares for the change by making
cgorup_migrate_prepare_dst() test ->subtree_control instead.
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 2b114368666c..ac5451e7c458 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -2527,11 +2527,11 @@ static int cgroup_migrate_prepare_dst(struct cgroup *dst_cgrp, lockdep_assert_held(&cgroup_mutex); /* - * Except for the root, subtree_ss_mask must be zero for a cgroup + * Except for the root, subtree_control must be zero for a cgroup * with tasks so that child cgroups don't compete against tasks. */ if (dst_cgrp && cgroup_on_dfl(dst_cgrp) && cgroup_parent(dst_cgrp) && - dst_cgrp->subtree_ss_mask) + dst_cgrp->subtree_control) return -EBUSY; /* look up the dst cset for each src cset and link it to src */ |