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Subject: Re: [RFC PATCH] ARM: Assume new page cache pages have dirty D-cache
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mundt <lethal@linux-sh.org>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
       Catalin Marinas <catalin.marinas@arm.com>, linux-kernel@vger.kernel.org,
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       James Bottomley <James.Bottomley@HansenPartnership.com>
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Date: Fri, 05 Mar 2010 15:46:19 +1100
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On Fri, 2010-03-05 at 10:28 +0900, Paul Mundt wrote:
> In the anonymous page case, flush_anon_page() is always called prior to
> flush_dcache_page(), so flush_anon_page() could just set PG_dcache_clean
> to work around that. That would handle get_user_pages(), too. 

Well, currently, we clear PG_arch_1 in flush_dcache_page(), at least on
ppc.

Now, I have a nagging feeling that we might not need to... I'll have to
give it a closer look when I'm back from this extended week-end :-)

Cheers,
Ben.