linux-kernel - Re: [RESEND PATCH v3 1/2] mm: Introducing arch

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Date:	Mon, 13 Apr 2015 13:59:51 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Ingo Molnar <mingo@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
	cov@...eaurora.org, criu@...nvz.org
Subject: Re: [RESEND PATCH v3 1/2] mm: Introducing arch_remap hook

On Mon, 13 Apr 2015 17:02:19 +0300 "Kirill A. Shutemov" <kirill@...temov.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


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