linux-kernel - Re: RFC: banning device driver reserved resources from /dev/mem

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Message-ID: <20081006150122.3860cae1@lxorguk.ukuu.org.uk>
Date:	Mon, 6 Oct 2008 15:01:22 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: RFC: banning device driver reserved resources from /dev/mem

> > Only a tiny fraction of devices in the world are PCI, and those
> > platforms where you most what /dev/mem type debugging tools are often
> > those without PCI
> 
> if you looked at the patch it's x86 only, and only active if you set
> CONFIG_STRICT_DEVMEM.
> (if you don't select CONFIG_STRICT_DEVMEM, which is off by default, you
> get unlimited access as usualy)

Lots of non PCI devices on x86 systems as well.

And the video problem is a big one for the x86 case as the VGA ISA window
is used by both the kernel and X without a helper driver.

Alan
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