linux-kernel - Re: mm: new mm hook framework

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Message-Id: <20150709142155.f749ec0dd92b0a4ee0ba8d32@linux-foundation.org>
Date:	Thu, 9 Jul 2015 14:21:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: mm: new mm hook framework

On Thu, 25 Jun 2015 10:42:45 +0200 Laurent Dufour <ldufour@...ux.vnet.ibm.com> wrote:

> > IMHO this screams for the generic version in include/asm-generic/,
> > and "generic-y += mm-arch-hooks.h" in arch/*/include/asm/Kbuild/.
> 
> I do like your proposal which avoid creating too many *empty* files.
> Since Andrew suggested the way I did the current patch, I'd appreciate
> his feedback too.

But this infrastructure works the other way.  If an architecture wants
a private implementation of arch_remap(), it adds a definition into
arch/XXX/include/asm/mm-arch-hooks.h and does #define arch_remap arch_remap.

If the architecture is OK with the default implementation of
arch_remap(), it does nothing at all.
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