From: Paolo Bonzini <pbonzini@redhat.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: kvm@vger.kernel.org,
Christoffer Dall <christoffer.dall@linaro.org>,
linux-mm@kvack.org, linux-s390@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-mips@linux-mips.org, ralf@linux-mips.org,
schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com
Subject: Re: [PATCH] mm: export symbol dependencies of is_zero_pfn()
Date: Sun, 14 Sep 2014 16:23:27 +0200 [thread overview]
Message-ID: <5415A4DF.90706@redhat.com> (raw)
In-Reply-To: <CAKv+Gu8=9tVmKtp5s_SyXF7mGjZ7r9x4iBYnyYfNpBogA9ShVg@mail.gmail.com>
Il 12/09/2014 23:19, Ard Biesheuvel ha scritto:
> On 12 September 2014 23:14, Andrew Morton <akpm@linux-foundation.org> wrote:
>> On Fri, 12 Sep 2014 22:17:23 +0200 Ard Biesheuvel <ard.biesheuvel@linaro.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@linaro.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?
Yes, will do.
Paolo
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prev parent reply other threads:[~2014-09-14 14:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 20:17 [PATCH] mm: export symbol dependencies of is_zero_pfn() Ard Biesheuvel
2014-09-12 21:14 ` Andrew Morton
2014-09-12 21:19 ` Ard Biesheuvel
2014-09-14 14:23 ` Paolo Bonzini [this message]
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