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memcg: keep root group unchanged if creation fails

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If the request is to create non-root group and we fail to meet it, we
should leave the root unchanged.

Signed-off-by: Hillf Danton <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hillf Danton 2011-12-19 17:11:57 -08:00 • committed by Linus Torvalds
commit a41c58a666
1 changed files with 1 additions and 2 deletions
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3
mm/memcontrol.c
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@ -4907,9 +4907,9 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
int cpu;
enable_swap_cgroup();
parent = NULL;
root_mem_cgroup = memcg;
if (mem_cgroup_soft_limit_tree_init())
goto free_out;
root_mem_cgroup = memcg;
for_each_possible_cpu(cpu) {
struct memcg_stock_pcp *stock =
&per_cpu(memcg_stock, cpu);
@ -4948,7 +4948,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
return &memcg->css;
free_out:
__mem_cgroup_free(memcg);
root_mem_cgroup = NULL;
return ERR_PTR(error);
}