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

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Message-ID: <20100226214908.GD23933@n2100.arm.linux.org.uk>
Date:	Fri, 26 Feb 2010 21:49:08 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	linux-usb@...r.kernel.org, "Mankad,Maulik Ojas" <x0082077@...com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ming Lei <tom.leiming@...il.com>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	Oliver Neukum <oliver@...kum.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Shilimkar,Santosh" <santosh.shilimkar@...com>,
	Pavel Machek <pavel@....cz>, Greg KH <greg@...ah.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: USB mass storage and ARM cache coherency

On Sat, Feb 27, 2010 at 08:40:29AM +1100, Benjamin Herrenschmidt wrote:
> Hrm, the DMA API certainly doesn't handle the I$/D$ coherency on
> powerpc.. I'm afraid that whole cache handling stuff is totally
> inconsistent since different archs have different expectations here.

It doesn't on ARM either.
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