Re: [PATCH] mm/debug: add a cast to u64 for atomic64_read()

[Arnd Bergmann]

On Mon, Mar 11, 2019 at 3:00 PM Qian Cai <cai@xxxxxx> wrote:
>
> On Mon, 2019-03-11 at 12:21 +0000, Jason Gunthorpe wrote:
> > On Sun, Mar 10, 2019 at 08:58:15PM -0700, Davidlohr Bueso wrote:
> > > On Sun, 10 Mar 2019, Qian Cai wrote:
> >
> > Not saying this patch shouldn't go ahead..
> >
> > But is there a special reason the atomic64*'s on ppc don't use the u64
> > type like other archs? Seems like a better thing to fix than adding
> > casts all over the place.
> >
>
> A bit of history here,
>
> https://patchwork.kernel.org/patch/7344011/#15495901

Ah, I had already forgotten about that discussion.

At least the atomic_long part we discussed there has been resolved now
as part of commit b5d47ef9ea5c ("locking/atomics: Switch to generated
atomic-long").

Adding Mark Rutland to Cc, maybe he has some ideas of how to use
the infrastructure he added to use consistent types for atomic64()
on the remaining 64-bit architectures.

     Arnd