linux-kernel - Re: possible regression on 3.13 when calling flush_dcache

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Message-ID: <20131216104927.GA9627@ldesroches-Latitude-E6320>
Date:	Mon, 16 Dec 2013 11:49:27 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <iamjoonsoo.kim@....com>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: possible regression on 3.13 when calling flush_dcache_page

On Thu, Dec 12, 2013 at 05:13:22PM +0000, Russell King - ARM Linux wrote:
> On Thu, Dec 12, 2013 at 03:31:50PM +0100, Ludovic Desroches wrote:
> > I'll investigate on atmel-mci driver side but if someone has also this
> > issue or see what is wrong in the driver, please tell me all about it.
> 
> I'm not entirely sure what's causing this, but calling flush_dcache_page()
> from an IRQ isn't the best idea, as one of its side effects will be to
> unmask IRQs at the CPU.
> 

Thans for pointing this point. Having a look to other mmc drivers, it
seems flush_dcache_page() is also called from an IRQ. Not sure that
deferring it is the way to go.

What should be the most proper solution?

> BTW, the faulting function seems to have been removed in more recent
> kernels.

Same error with rc4 and linux-next.
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