Re: [PATCH v7 1/2] mm: introduce process_mrelease system call

[Michal Hocko <mhocko@suse.com>]

On Fri 06-08-21 02:23:17, Shakeel Butt wrote:
> On Thu, Aug 5, 2021 at 11:40 PM Michal Hocko <mhocko@suse.com> wrote:
> >
> [...]
> > I think you really want something like this:
> >
> >         if (flags)
> >                 return -EINVAL;
> >
> >         pid = pidfd_get_pid(fd, &f_flags);
> >         if (IS_ERR(pid))
> >                 return PTR_ERR(pid);
> >         task = get_pid_task(pid, PIDTYPE_PID);
> >         if (!task) {
> >                 ret = -ESRCH;
> >                 goto put_pid;
> >         }
> >
> >         /*
> >          * Make sure to chose a thread which still has a reference to mm
> >          * during the group exit
> >          */
> >         p = find_lock_task_mm(task);
> >         if (!p) {
> >                 ret = -ESRCH;
> >                 goto put_task;
> >         }
> >
> >         mm = task->mm;
> 
> mm = p->mm;

right. Thanks!

-- 
Michal Hocko
SUSE Labs