[PATCH v2 08/25] arch: introduce memremap()

[Christoph Hellwig]

On Mon, Jul 27, 2015 at 04:26:03PM -0700, Dan Williams wrote:
> Oh, because all we have at this point is ioremap_cache() which
> silently falls back.  It's not until the introduction of
> arch_memremp() where we update the arch code to break that behavior.

Ok, makes sense.  Might be worth to document in the changelog.

> That said, I think it may be beneficial to allow a fallback if the
> user cares.  So maybe memremap() can call plain ioremap() if
> MEMREMAP_STRICT is not set and none of the other mapping types are
> satisfied.

Is there a real use case for it?  Fallback APIs always seem confusing
and it might make more sense to do this in the caller(s) that actually
need it.