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

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Message-ID: <20100307082344.GB1987@elf.ucw.cz>
Date:	Sun, 7 Mar 2010 09:23:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	James.Bottomley@...senPartnership.com, benh@...nel.crashing.org,
	linux@....linux.org.uk, mdharm-kernel@...-eyed-alien.net,
	linux-usb@...r.kernel.org, x0082077@...com,
	sshtylyov@...mvista.com, tom.leiming@...il.com,
	bigeasy@...utronix.de, oliver@...kum.org,
	linux-kernel@...r.kernel.org, santosh.shilimkar@...com,
	greg@...ah.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: USB mass storage and ARM cache coherency

Hi!

> > Seems like ARM has requirement other architectures do not, that is
> > a) not documented anywhere
> > b) causes problems
> 
> Well, ARM is pretty similar to other architectures in this respect. And
> I'm sure other architectures have similar problems, only that they only
> become visible in some circumstances they may not have encountered (i.e.
> PIO drivers + filesystem that doesn't call flush_dcache_page like ext*).
> Some other architectures may do heavier flushing
> 
> Of course, a Documentation/arm/cachetlb.txt file would make sense.

Actually, short/simple documentation for driver authors would be even
better. Then you can claim it is bug in driver :-).
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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