Re: [v4 PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct

From: Cyrill Gorcunov
Date: Wed Apr 18 2018 - 05:02:27 EST

On Wed, Apr 18, 2018 at 10:05:55AM +0200, Michal Hocko wrote:
> Yes, looks good to me. As mentioned in other emails prctl_set_mm_map
> really deserves a comment explaining why we are doing the down_read
> What about something like the following?
> "
> arg_lock protects concurent updates but we still need mmap_sem for read
> to exclude races with do_brk.
> "
> Acked-by: Michal Hocko <mhocko@xxxxxxxx>

Yes, thanks! Andrew, could you slightly update the changelog please?