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

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Message-Id: <201002250448.17866.oliver@neukum.org>
Date:	Thu, 25 Feb 2010 04:48:17 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Greg KH <greg@...ah.com>,
	"Mankad, Maulik Ojas" <x0082077@...com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	linux-usb@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	Pavel Machek <pavel@....cz>, Ming Lei <tom.leiming@...il.com>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: USB mass storage and ARM cache coherency

Am Mittwoch, 24. Februar 2010 22:12:34 schrieb Benjamin Herrenschmidt:
> On Wed, 2010-02-24 at 08:16 +0100, Oliver Neukum wrote:
> > I don't know. The issue seems quite complex. It would seem better to
> > centralize it as far as practical. Do you have a wrapper drivers could
> > call?
> 
> flush_dcache_page() ? :-)

Will this do anything on arches that don't need it?
Secondly, can we have a wrapper that you can pass a pointer and an
offset?
 
> Now, the subsystem might be the one to know whether something is mapped
> into userspace or not (v4l in our case) in which case a wrapper could be
> created.

If possible, I'd like to centralize this. Drivers are likely to get this wrong.

	Regards
		Oliver
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