Re: [PATCHv3 1/3] ARM: mm: allow sub-architectures to override PCI I/O memory type

On Mon, May 19, 2014 at 05:40:51PM +0100, Arnd Bergmann wrote:

On Monday 19 May 2014 15:23:55 Will Deacon wrote:

quoted

Fair enough -- I just don't think we should dress up an erratum workaround as
a bug fix, especially when it's adding a new user of strongly-ordered memory
to the kernel which we can't honour for arm64.

Makes sense. How about a patch then that just changes the memory type for
the I/O space and adds a comment explaining all we found out? From what
I can tell, strict ordering is required for Armada 3xx, may or may not
be required elsewhere but should never hurt noticeably. We may want to restrict
it to ARMv6/v7 so we don't have to pick the right domain.

Ok, and we don't bother with the extra dsb in outb? I'm alright with that if
the comment goes into enough detail.

Will
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