From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
viro@zeniv.linux.org.uk, glauber@scylladb.com,
syzkaller@googlegroups.com
Subject: Re: [PATCH v2 1/2] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed.
Date: Fri, 24 Nov 2017 14:28:57 +0100 [thread overview]
Message-ID: <20171124132857.vi4t7szmbknywng7@dhcp22.suse.cz> (raw)
In-Reply-To: <201711242221.BJD26077.SFOtVQJMFHOOFL@I-love.SAKURA.ne.jp>
On Fri 24-11-17 22:21:55, Tetsuo Handa wrote:
> Michal Hocko wrote:
> > > Since we can encourage register_shrinker() callers to check for failure
> > > by marking register_shrinker() as __must_check, unregister_shrinker()
> > > can stay silent.
> >
> > I am not sure __must_check is the right way. We already do get
> > allocation warning if the registration fails so silent unregister is
> > acceptable. Unchecked register_shrinker is a bug like any other
> > unchecked error path.
>
> I consider that __must_check is the simplest way to find all of
> unchecked register_shrinker bugs. Why not to encourage users to fix?
because git grep doesn't require to patch the kernel and still provide
the information you want. I would understand __must_check if we had
hundreds users of this api and they come and go quickly.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2017-11-24 13:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-24 11:36 [PATCH v2 1/2] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed Tetsuo Handa
2017-11-24 11:36 ` [PATCH v2 2/2] mm,vmscan: Mark register_shrinker() as __must_check Tetsuo Handa
2017-11-24 12:24 ` Michal Hocko
2017-11-24 13:26 ` Tetsuo Handa
2017-11-24 13:37 ` Michal Hocko
2017-11-24 12:21 ` [PATCH v2 1/2] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed Michal Hocko
2017-11-24 13:21 ` Tetsuo Handa
2017-11-24 13:28 ` Michal Hocko [this message]
2017-11-25 1:40 ` Tetsuo Handa
2017-11-27 8:29 ` Michal Hocko
2017-11-29 13:44 ` Tetsuo Handa
2017-11-29 13:55 ` Michal Hocko
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