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SubjectRe: [PATCH 0/3] io.h, logic_pio: Allow barriers for inX() and outX() be overridden
On Wed, Mar 18, 2020 at 4:59 PM John Garry <> 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:
> 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 <>

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