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Subject: Problem with /proc/iomem on ARM
Date: Wed, 1 Jul 2009 13:32:19 -0400
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Thread-Topic: Problem with /proc/iomem on ARM
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From: "H Hartley Sweeten" <hartleys@visionengravers.com>
To: <kay.sievers@vrfy.org>
Cc: <linux-kernel@vger.kernel.org>
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Hello Kay,

I just noticed a problem with /proc/iomem on my ARM system
that I think was introduced by your patch:

commit 1d559e29138834bbcdf34ac072232bf543bfc4e0
Author: Kay Sievers <kay.sievers@vrfy.org>
Date:   Tue Jan 6 10:44:43 2009 -0800

    arm: struct device - replace bus_id with dev_name(), dev_set_name()

    Cc: Russell King <rmk@arm.linux.org.uk>
    Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

On my ep93xx ARM system I have three pl010 uarts: "apb:uart1",
"apb:uart2", and "apb:uart3".  For /proc/iomem I used to see:

/ # cat proc/iomem
...
808c0000-808c0fff : apb:uart1
  808c0000-808c003f : uart-pl010
808d0000-808d0fff : apb:uart2
  808d0000-808d003f : uart-pl010
808e0000-808e0fff : apb:uart3
  808e0000-808e003f : uart-pl010
...

Now it shows up as:

/ # cat proc/iomem
...
808c0000-808c0fff : <BAD>
  808c0000-808c003f : uart-pl010
808d0000-808d0fff : <BAD>
  808d0000-808d003f : uart-pl010
808e0000-808e0fff : <BAD>
  808e0000-808e003f : uart-pl010
...

Is this a regression or is there something else going on?

This was seen with kernel 2.6.30.  I havn't looked at /proc/iomem for
a while so I'm not sure when this first started.

Regards,
Hartley
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