[RESEND PATCH v3 1/2] mm: Introducing arch_remap hook

[Andrew Morton]

On Mon, 13 Apr 2015 17:02:19 +0300 "Kirill A. Shutemov" <kirill at shutemov.name> wrote:

> > Kirill, if I'm right with it, can you suggest the header where to put
> > the "generic" mremap hook's (empty) body?
> 
> I initially thought it would be enough to put it into
> <asm-generic/mmu_context.h>, expecting it works as
> <asm-generic/pgtable.h>. But that's not the case.
> 
> It probably worth at some point rework all <asm/mmu_context.h> to include
> <asm-generic/mmu_context.h> at the end as we do for <asm/pgtable.h>.
> But that's outside the scope of the patchset, I guess.
> 
> I don't see any better candidate for such dummy header. :-/

Do away with __HAVE_ARCH_REMAP and do it like this:

arch/x/include/asm/y.h:

	extern void arch_remap(...);
	#define arch_remap arch_remap

include/linux/z.h:

	#include <asm/y.h>

	#ifndef arch_remap
	static inline void arch_remap(...) { }
	#define arch_remap arch_remap
	#endif