linux-kernel - Re: [PATCH] mm: export symbol dependencies of is_zero

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Date:	Fri, 12 Sep 2014 14:14:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	kvm@...r.kernel.org, pbonzini@...hat.com,
	christoffer.dall@...aro.org, linux-mm@...ck.org,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH] mm: export symbol dependencies of is_zero_pfn()

On Fri, 12 Sep 2014 22:17:23 +0200 Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:

> In order to make the static inline function is_zero_pfn() callable by
> modules, export its symbol dependencies 'zero_pfn' and (for s390 and
> mips) 'zero_page_mask'.

So hexagon and score get the export if/when needed.

> We need this for KVM, as CONFIG_KVM is a tristate for all supported
> architectures except ARM and arm64, and testing a pfn whether it refers
> to the zero page is required to correctly distinguish the zero page
> from other special RAM ranges that may also have the PG_reserved bit
> set, but need to be treated as MMIO memory.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
>  arch/mips/mm/init.c | 1 +
>  arch/s390/mm/init.c | 1 +
>  mm/memory.c         | 2 ++

Looks OK to me.  Please include the patch in whichever tree is is that
needs it, and merge it up via that tree.

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