linux-kernel - Re: [PATCH 0/3] exec: Transform exec_update_mutex into a rw

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Date:   Thu, 3 Dec 2020 20:56:15 -0500
From:   Waiman Long <longman@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Davidlohr Bueso <dave@...olabs.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Jann Horn <jannh@...gle.com>,
        Vasiliy Kulikov <segoon@...nwall.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Christopher Yeoh <cyeoh@....ibm.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Arnd Bergmann <arnd@...db.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH 0/3] exec: Transform exec_update_mutex into a rw_semaphore

On 12/3/20 5:42 PM, Linus Torvalds wrote:
> On Thu, Dec 3, 2020 at 12:10 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>> The simplest and most robust solution appears to be making
>> exec_update_mutex a read/write lock and having everything execept for
>> exec take the lock for read.
> Looks sane to me.
>
> I'd like the locking people to look at the down_read_*() functions,
> even if they look simple. Adding Waiman and Davidlohr to the cc just
> in case they would look at that too, since they've worked on that
> code.

I have looked at patches 1 & 2 on adding down_read_killable_nested() and 
down_read_interruptible(). They looks good to me.

Cheers,
Longman