linux-kernel - Re: USB mass storage and ARM cache coherency

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Date:	Fri, 12 Mar 2010 08:44:31 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	mdharm-kernel@...-eyed-alien.net, oliver@...kum.org,
	linux@....linux.org.uk, greg@...ah.com, x0082077@...com,
	sshtylyov@...mvista.com, Catalin Marinas <catalin.marinas@....com>,
	bigeasy@...utronix.de, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-sh@...r.kernel.org, santosh.shilimkar@...com,
	Pavel Machek <pavel@....cz>, tom.leiming@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: USB mass storage and ARM cache coherency

On Wed, 2010-03-10 at 12:52 +0900, Paul Mundt wrote:
> Well, it does start to get a bit painful with sparsemem section or
> NUMA
> node IDs also digging in to the page flags on 32-bit.. the benefits
> would
> have to be pretty compelling to offset the pain. 

Unless we play a dangerous trick and re-use another flag that isn't
meaningful for allocated pages... maybe PG_buddy ? Or do I miss
something about that guy semantics ?

Cheers,
Ben.

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