linux-kernel - Re: UML fails to locate address space

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Message-ID: <Pine.LNX.4.61.0805201751500.13532@chaos.analogic.com>
Date:	Tue, 20 May 2008 17:54:34 -0400
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Jeff Dike" <jdike@...toit.com>
Cc:	"Tom Spink" <tspink@...il.com>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: UML fails to locate address space

On Tue, 20 May 2008, Jeff Dike wrote:

> On Tue, May 20, 2008 at 11:22:08AM -0400, linux-os (Dick Johnson) wrote:
>> Does this mean that I cannot mmap() address zero in the kernel
>> anymore? I should be able (in the kernel) read anything, and
>> then mmap() it to something usable in user-space. If address
>> zero is now artifically trapped there are problems being created
>> for no good reason at all.
>
> We're operating from userspace here.
>
> In any case, this hasn't happened with any kernel I've seen, but I'm
> suspicious that Ubuntu has started treating page zero specially.
>
> 	   	       	   Jeff

Okay, then instead of putting a NULL in the "hint" to mmap() try
something else (0x1000?). That may help.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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