Re: [RFC PATCH] powerpc/spufs: fix copy_to_user while atomic

[Arnd Bergmann]

On Wed, Apr 29, 2020 at 8:33 AM Jeremy Kerr <jk@xxxxxxxxxx> wrote:
>
> Hi Christoph,
>
> > And another one that should go on top of this one to address Al's other
> > compaint:
>
> Yeah, I was pondering that one. The access_ok() is kinda redundant, but
> it does avoid forcing a SPU context save on those errors.
>
> However, it's not like we really need to optimise for the case of
> invalid addresses from userspace. So, I'll include this change in the
> submission to Michael's tree. Arnd - let me know if you have any
> objections.

Sounds good. A lot of the access_ok() checks in the kernel are redundant
or wrong, I think it makes a lot of sense to remove these.

       Arnd