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Message-ID: <20191114225408.GO4163745@devbig004.ftw2.facebook.com>
Date: Thu, 14 Nov 2019 14:54:08 -0800
From: Tejun Heo <tj@...nel.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: cgroups@...r.kernel.org,
Linux-Next Mailing List <linux-next@...r.kernel.org>,
namhyung@...nel.org, open list <linux-kernel@...r.kernel.org>,
lkft-triage@...ts.linaro.org, lizefan@...wei.com,
hannes@...xchg.org, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, kafai@...com,
Song Liu <songliubraving@...com>
Subject: [PATCH cgroup/for-5.5] cgroup: fix incorrect WARN_ON_ONCE() in
cgroup_setup_root()
Never mind. I just failed to see the warning on x86_32. The warning
is spurious and fixed with the following commit. Applied to
cgroup/for-5.5.
Thanks.
------ 8< ------
>From d7495343228f30d8206e92dccfd1c41adcfa142d Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@...nel.org>
Date: Thu, 14 Nov 2019 14:46:51 -0800
743210386c03 ("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@...aro.org>
Fixes: 743210386c03 ("cgroup: use cgrp->kn->id as the cgroup ID")
Signed-off-by: Tejun Heo <tj@...nel.org>
---
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 c12dcf7dc432..53098c1d45e2 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1966,7 +1966,7 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
goto exit_root_id;
}
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);
ret = css_populate_dir(&root_cgrp->self);
--
2.17.1
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