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mm/memcg: iteration skip memcgs not yet fully initialized

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It is surprising that the mem_cgroup iterator can return memcgs which
have not yet been fully initialized.  By accident (or trial and error?)
this appears not to present an actual problem; but it may be better to
prevent such surprises, by skipping memcgs not yet online.

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Tejun Heo <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: <[email protected]>	[3.12+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins authored and Linus Torvalds committed 2014-01-23 16:36:53 -08:00
1 parent d2ab70aaae
commit d8ad305597
1 file changed
+2 -4
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mm/memcontrol.c
+2 -4
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@@ -1119,10 +1119,8 @@ skip_node:
* protected by css_get and the tree walk is rcu safe.
*/
if (next_css) {
struct mem_cgroup *mem = mem_cgroup_from_css(next_css);
if (css_tryget(&mem->css))
return mem;
if ((next_css->flags & CSS_ONLINE) && css_tryget(next_css))
return mem_cgroup_from_css(next_css);
else {
prev_css = next_css;
goto skip_node;