Subject: Re: USB mass storage and ARM cache coherency
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Oliver Neukum <oliver@neukum.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
       Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
       Russell King - ARM Linux <linux@arm.linux.org.uk>,
       Greg KH <greg@kroah.com>, "Mankad, Maulik Ojas" <x0082077@ti.com>,
       Sergei Shtylyov <sshtylyov@ru.mvista.com>,
       Sebastian Siewior <bigeasy@linutronix.de>, linux-usb@vger.kernel.org,
       linux-kernel <linux-kernel@vger.kernel.org>,
       James Bottomley <James.Bottomley@hansenpartnership.com>,
       "Shilimkar, Santosh" <santosh.shilimkar@ti.com>,
       Pavel Machek <pavel@ucw.cz>, Ming Lei <tom.leiming@gmail.com>,
       linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
In-Reply-To: <201002240816.10178.oliver@neukum.org>
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Date: Thu, 25 Feb 2010 08:12:34 +1100
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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() ? :-)

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.

Cheers,
Ben.


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