linux-kernel - Re: [PATCH v2] /dev/mem: use phys_addr

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Date:	Wed, 12 Sep 2012 11:15:03 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Cyril Chemparathy <cyril@...com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	arnd@...db.de, dhowells@...hat.com, fenghua.yu@...el.com,
	lethal@...ux-sh.org, linux@....linux.org.uk, nico@...aro.org,
	rob.herring@...xeda.com, tony.luck@...el.com, tony@...mide.com,
	will.deacon@....com
Subject: Re: [PATCH v2] /dev/mem: use phys_addr_t for physical addresses

On Wed, Sep 12, 2012 at 02:05:58PM -0400, Cyril Chemparathy wrote:
> This patch fixes the /dev/mem driver to use phys_addr_t for physical
> addresses.  This is required on PAE systems, especially those that run
> entirely out of >4G physical memory space.

What is the symptom if this patch is not applied?  Does it need to be
backported to older kernels?  If so, which ones?

thanks,

greg k-h
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