linux-kernel - Re: i386 doublefault handler is broken with CONFIG_DEBUG

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Message-ID: <46BBA4CB.7070009@redhat.com>
Date:	Thu, 09 Aug 2007 19:35:39 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: i386 doublefault handler is broken with CONFIG_DEBUG_SPINLOCK

On 08/09/2007 07:16 PM, Andi Kleen wrote:
> 
> I tested it. Even on a box without spin lock debugging I get a hard
> hang after
> 
> double fault, gdt at c1404000 [255 bytes]
> 
> even though it should have printed the registers.
> So it looks like there is more broken in the DF handler than just
> this.

Looks like it just fails the ptr_ok() test:

#define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + 0x1000000)

page_offset  c0000000
            + 1000000

           < c1404000

What should that be changed to, or is there some easier way to test that?
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