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cgroup: fix incorrect WARN_ON_ONCE() in cgroup_setup_root()

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743210386c ("cgroup: use cgrp->kn->id as the cgroup ID") added WARN
which triggers if cgroup_id(root_cgrp) is not 1.  This is fine on
64bit ino archs but on 32bit archs cgroup ID is ((gen << 32) | ino)
and gen starts at 1, so the root id is 0x1_0000_0001 instead of 1
always triggering the WARN.

What we wanna make sure is that the ino part is 1.  Fix it.

Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Fixes: 743210386c ("cgroup: use cgrp->kn->id as the cgroup ID")
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2019-11-14 14:46:51 -08:00
parent 743210386c
commit d749534322
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
kernel/cgroup/cgroup.c
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@ -1966,7 +1966,7 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
goto exit_root_id; goto exit_root_id;
} }
root_cgrp->kn = root->kf_root->kn; root_cgrp->kn = root->kf_root->kn;
WARN_ON_ONCE(cgroup_id(root_cgrp) != 1); WARN_ON_ONCE(cgroup_ino(root_cgrp) != 1);
root_cgrp->ancestor_ids[0] = cgroup_id(root_cgrp); root_cgrp->ancestor_ids[0] = cgroup_id(root_cgrp);
ret = css_populate_dir(&root_cgrp->self); ret = css_populate_dir(&root_cgrp->self);