linux-kernel - Re: [PATCH 04/10] powerpc: Prepare to support kernel handling of IOMMU map/unmap

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Date:	Wed, 24 Jul 2013 15:43:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alexander Graf <agraf@...e.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm-ppc@...r.kernel.org, linux-mm@...ck.org,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 04/10] powerpc: Prepare to support kernel handling of
 IOMMU map/unmap

On Tue, 23 Jul 2013 12:22:59 +1000 Alexey Kardashevskiy <aik@...abs.ru> wrote:

> Ping, anyone, please?

ew, you top-posted.

> Ben needs ack from any of MM people before proceeding with this patch. Thanks!

For what?  The three lines of comment in page-flags.h?   ack :)

Manipulating page->_count directly is considered poor form.  Don't
blame us if we break your code ;)

Actually, the manipulation in realmode_get_page() duplicates the
existing get_page_unless_zero() and the one in realmode_put_page()
could perhaps be placed in mm.h with a suitable name and some
documentation.  That would improve your form and might protect the code
from getting broken later on.

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