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Date: Wed, 12 Apr 2006 14:45:34 +1000
From: Paul Mackerras <paulus@samba.org>
To: Ian Romanick <idr@us.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: Special handling of sysfs device resource files?
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Ian Romanick writes:

> This seems to mostly work, but I am having one problem.  I map the
> region by opening the file with O_RDWR, then mmap with
> (PROT_READ|PROT_WRITE) and MAP_SHARED.  In all cases, the open and mmap
> succeed.  However, for I/O BARs, the resulting pointer from mmap is
> invalid.  Any access to it results in a segfault and GDB says it's "out
> of range".

On which architecture(s)?

Paul.