linux-kernel - Re: [PATCH v3 2/6] uio: Add new UIO_MEM_PHYS

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Message-ID: <20141031093557.GT27405@n2100.arm.linux.org.uk>
Date:	Fri, 31 Oct 2014 09:35:57 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	Ankit Jindal <ankit.jindal@...aro.org>,
	linux-kernel@...r.kernel.org, "Hans J. Koch" <hjk@...sjkoch.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	patches@....com, linux-arm-kernel@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Tushar Jagad <tushar.jagad@...aro.org>,
	devicetree@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Varka Bhadram <varkabhadram@...il.com>
Subject: Re: [PATCH v3 2/6] uio: Add new UIO_MEM_PHYS_CACHE type for mem
 regions

On Tue, Oct 21, 2014 at 08:38:23AM +0200, Kumar Gala wrote:
> Rather than adding a new type, why not allow the driver to set the

Please wrap your message.

That doesn't work.  A pgprot_t contains more than just memory type
information.  It also contains access permissions.  In other words,
if the user requested read-only or a read-write mapping, the
permissions will be different.

If you always use your stored pgprot_t, then you will override the
users requested permissions.

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