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authorMichal Koutný2022-08-26 18:52:37 +0200
committerTejun Heo2022-08-26 10:57:41 -1000
commitfa7e439cf90ba23ea473d0b7d85efd02ae6ccf94 (patch)
tree9361bef45e46f7ba7fd29ea16ca23405cfbfce97 /mm/memcontrol.c
parent4534dee941056a4ab9dca4a9e2edff28692800b2 (diff)
cgroup: Homogenize cgroup_get_from_id() return value
Cgroup id is user provided datum hence extend its return domain to include possible error reason (similar to cgroup_get_from_fd()). This change also fixes commit d4ccaf58a847 ("bpf: Introduce cgroup iter") that would use NULL instead of proper error handling in d4ccaf58a847 ("bpf: Introduce cgroup iter"). Additionally, neither of: fc_appid_store, bpf_iter_attach_cgroup, mem_cgroup_get_from_ino (callers of cgroup_get_from_fd) is built without CONFIG_CGROUPS (depends via CONFIG_BLK_CGROUP, direct, transitive CONFIG_MEMCG respectively) transitive, so drop the singular definition not needed with !CONFIG_CGROUPS. Fixes: d4ccaf58a847 ("bpf: Introduce cgroup iter") Signed-off-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b69979c9ced5..86f5ca8c6fa6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5110,8 +5110,8 @@ struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
struct mem_cgroup *memcg;
cgrp = cgroup_get_from_id(ino);
- if (!cgrp)
- return ERR_PTR(-ENOENT);
+ if (IS_ERR(cgrp))
+ return PTR_ERR(cgrp);
css = cgroup_get_e_css(cgrp, &memory_cgrp_subsys);
if (css)