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Subject[PATCH 2/2] cgroup: get the wrong css for css_alloc() during cgroup_init_subsys()
Date
css_alloc() needs the parent css, while cgroup_css() gets current
cgropu's css. So we are getting the wrong css during
cgroup_init_subsys().

Fortunately, cgrp_dfl_root.cgrp's css is not set yet, so the value we
pass to css_alloc() doesn't harm to the system.

Let's pass NULL directly during init, since we know there is no parent
yet.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
kernel/cgroup/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index dffef5836ff7..452a723d4a36 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5709,7 +5709,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss, bool early)

/* Create the root cgroup state for this subsystem */
ss->root = &cgrp_dfl_root;
- css = ss->css_alloc(cgroup_css(&cgrp_dfl_root.cgrp, ss));
+ css = ss->css_alloc(NULL);
/* We don't handle early failures gracefully */
BUG_ON(IS_ERR(css));
init_and_link_css(css, ss, &cgrp_dfl_root.cgrp);
--
2.33.1
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