Re: [PATCH 0/3] exec: Transform exec_update_mutex into a rw_semaphore

[Davidlohr Bueso]

On Thu, 03 Dec 2020, Linus Torvalds wrote:

> On Thu, Dec 3, 2020 at 12:10 PM Eric W. Biederman <ebiederm@xxxxxxxxxxxx> 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.

rwsem changes look good to me - and 3/3 looks much nicer than the previous
alternatives to the deadlock.

Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>