Re: [PATCH 0/3] io.h, logic_pio: Allow barriers for inX() and outX() be overridden

[Arnd Bergmann]

On Wed, Mar 18, 2020 at 4:59 PM John Garry <john.garry@xxxxxxxxxx> wrote:
>
> Since commits a7851aa54c0c ("io: change outX() to have their own IO
> barrier overrides") and 87fe2d543f81 ("io: change inX() to have their own
> IO barrier overrides"), the outX() and inX() functions have memory
> barriers which can be overridden per-arch.
>
> However, under CONFIG_INDIRECT_PIO, logic_pio defines its own version of
> inX() and outX(), which still use readb et al. For these, the barrier
> after a raw read is weaker than it otherwise would be.
>
> This series generates consistent behaviour for logic_pio, by defining
> generic _inX() and _outX() in asm-generic/io.h, and using those in
> logic_pio. Generic _inX() and _outX() have per-arch overrideable
> barriers.
>
> The topic was discussed there originally:
> https://lore.kernel.org/lkml/2e80d7bc-32a0-cc40-00a9-8a383a1966c2@xxxxxxxxxx/
>
> A small tidy-up patch is included.
>
> I hope that series can go through the arm-soc tree, as with other recent
> logic_pio changes.

Looks good to me, thanks for the cleanup!

Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>