From: Andrew Morton <akpm@linux-foundation.org>
To: Roman Gushchin <guro@fb.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>,
Muchun Song <songmuchun@bytedance.com>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
<duanxiongchun@bytedance.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
<hannes@cmpxchg.org>, <mhocko@kernel.org>, <shakeelb@google.com>,
<vdavydov.dev@gmail.com>
Subject: Re: [PATCH] mm: memcontrol: fix forget to obtain the ref to objcg in split_page_memcg
Date: Fri, 2 Apr 2021 18:04:54 -0700 [thread overview]
Message-ID: <20210402180454.c28395d38396b58659c15fcc@linux-foundation.org> (raw)
In-Reply-To: <YGU/ZojpKXXK9AnU@carbon.DHCP.thefacebook.com>
On Wed, 31 Mar 2021 20:35:02 -0700 Roman Gushchin <guro@fb.com> wrote:
> On Thu, Apr 01, 2021 at 11:31:16AM +0800, Miaohe Lin wrote:
> > On 2021/4/1 11:01, Muchun Song wrote:
> > > Christian Borntraeger reported a warning about "percpu ref
> > > (obj_cgroup_release) <= 0 (-1) after switching to atomic".
> > > Because we forgot to obtain the reference to the objcg and
> > > wrongly obtain the reference of memcg.
> > >
> > > Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
> > > Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> >
> > Thanks for the patch.
> > Is a Fixes tag needed?
>
> No, as the original patch hasn't been merged into the Linus's tree yet.
> So the fix can be simply squashed.
Help. Which is "the original patch"?
> Btw, the fix looks good to me.
>
> Acked-by: Roman Gushchin <guro@fb.com>
next prev parent reply other threads:[~2021-04-03 1:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 3:01 [PATCH] mm: memcontrol: fix forget to obtain the ref to objcg in split_page_memcg Muchun Song
2021-04-01 3:04 ` Shakeel Butt
2021-04-01 3:31 ` Miaohe Lin
2021-04-01 3:35 ` Roman Gushchin
2021-04-01 3:38 ` Miaohe Lin
2021-04-03 1:04 ` Andrew Morton [this message]
2021-04-03 1:10 ` Shakeel Butt
2021-04-03 1:12 ` Roman Gushchin
2021-04-12 10:41 ` Christian Borntraeger
2021-04-12 10:53 ` [External] " Muchun Song
2021-04-12 11:05 ` Christian Borntraeger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210402180454.c28395d38396b58659c15fcc@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=borntraeger@de.ibm.com \
--cc=duanxiongchun@bytedance.com \
--cc=guro@fb.com \
--cc=hannes@cmpxchg.org \
--cc=linmiaohe@huawei.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=shakeelb@google.com \
--cc=songmuchun@bytedance.com \
--cc=vdavydov.dev@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).