Re: [RFC PATCH 0/8] Rework READ_ONCE() to improve codegen

[Arnd Bergmann]

On Fri, Jan 10, 2020 at 5:56 PM Will Deacon <will@xxxxxxxxxx> wrote:
>
> I have more patches in this area because I'm trying to move all the
> read_barrier_depends() magic into arch/alpha/, but I'm holding off until
> we agree on this part first.

Isn't the read_barrier_depends() the only reason for actually needing
the temporary local variable that must not be volatile?

If you make alpha provide its own READ_ONCE() as the first
step, it would seem that the rest of the series gets much easier
as the others can go back to the simple statement from your

#define __READ_ONCE(x)  (*(volatile __unqual_scalar_typeof(x) *)&(x))

      Arnd