linux-kernel - Re: [RFC PATCH] ARM: Assume new page cache pages have dirty D-cache

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Date:	Fri, 05 Mar 2010 15:46:19 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [RFC PATCH] ARM: Assume new page cache pages have dirty D-cache

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.


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