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SubjectRe: [RFC PATCH 1/3] asm-generic: io: Add exec versions of ioremap
On Wed, May 18, 2016 at 10:25:03PM +0200, Arnd Bergmann wrote:
> The ARM version of ioremap_exec() that gets added in this patch is cached
> (like memremap()), but then the asm-generic version is not? This is
> even more confusing, it should at least do roughly the same thing across
> architectures.
>
> There should also be some documentation about what the expected behavior is, e.g.:
>
> - is memremap_exec() by default cached or not? (I assume it would
> be like memremap())
> - If we have an interface that does explicit uncached executable mapping,
> what about architectures on which this is not possible? Should they
> fall back to cached or non-executable, or cause a link error?

Another important point is whether atomic instructions / kernel locks
can be located within the mapped memory.

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