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From:   Yosry Ahmed <yosryahmed@google.com>
Date:   Fri, 31 Mar 2023 12:03:47 -0700
Message-ID: <CAJD7tka-2vNn25=NdrKQoMf4ntdbWtojY0k4eAa-c9D+v7J=HQ@mail.gmail.com>
Subject: Re: [PATCH v2 4/9] cgroup: rstat: add WARN_ON_ONCE() if flushing
 outside task context
To:     Michal Hocko <mhocko@suse.com>
Cc:     Johannes Weiner <hannes@cmpxchg.org>,
        Shakeel Butt <shakeelb@google.com>, Tejun Heo <tj@kernel.org>,
        Josef Bacik <josef@toxicpanda.com>,
        Jens Axboe <axboe@kernel.dk>,
        Zefan Li <lizefan.x@bytedance.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Muchun Song <muchun.song@linux.dev>,
        Andrew Morton <akpm@linux-foundation.org>,
        =?UTF-8?Q?Michal_Koutn=C3=BD?= <mkoutny@suse.com>,
        Vasily Averin <vasily.averin@linux.dev>,
        cgroups@vger.kernel.org, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        bpf@vger.kernel.org
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On Fri, Mar 31, 2023 at 4:02=E2=80=AFAM Michal Hocko <mhocko@suse.com> wrot=
e:
>
> On Thu 30-03-23 01:53:38, Yosry Ahmed wrote:
> [...]
> > Maybe we can add a primitive like might_sleep() for this, just food for=
 thought.
>
> I do not think it is the correct to abuse might_sleep if the function
> itself doesn't sleep. If it does might_sleep is already involved.

Oh, sorry if I wasn't clear, I did not mean to reuse might_sleep() --
I meant introducing a new similar debug primitive that shouts if irqs
are disabled.

> --
> Michal Hocko
> SUSE Labs