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

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Message-ID: <CAKv+Gu8=9tVmKtp5s_SyXF7mGjZ7r9x4iBYnyYfNpBogA9ShVg@mail.gmail.com>
Date:	Fri, 12 Sep 2014 23:19:27 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kvm@...r.kernel.org, pbonzini@...hat.com,
	Christoffer Dall <christoffer.dall@...aro.org>,
	linux-mm@...ck.org, linux-s390@...r.kernel.org,
	"linux-kernel@...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 12 September 2014 23:14, Andrew Morton <akpm@...ux-foundation.org> wrote:
> 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.
>

Exactly.

>> 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.
>

Thanks.

@Paolo: could you please take this (with Andrew's ack), and put it
before the patch you took earlier today?

Thanks,
Ard.
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