Re: [PATCH] generic arch_futex_atomic_op_inuser() cleanup

[Arnd Bergmann]

On Mon, Jul 15, 2019 at 12:29 PM Vasily Averin <vvs@xxxxxxxxxxxxx> wrote:
>
> Looks like this code is dead and therefore looks strange.
> I've found it during manual code review and decided to send patch
> to pay your attention to this problem.
> Probably it's better to remove this code at all?
>
> On 7/15/19 1:27 PM, Vasily Averin wrote:
> > Access to 'op' variable does not require pagefault_disable(),
> > 'ret' variable should be initialized before using,
> > 'oldval' variable can be replaced by constant.
> >
> > Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>

I'm not following the reasoning for any of the changes here. Why do you
think we don't need the pagefault_disable() around get_user()/put_user(),
and which part of the funtion is dead code?

       Arnd