linux-ext4 - Re: [RFC 1/1] mm: add virt to phys debug

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Message-ID: <4820D39E.3090109@gmail.com>
Date:	Tue, 06 May 2008 23:54:38 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Christoph Lameter <clameter@....com>
CC:	linux-mm@...ck.org, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>, pageexec@...email.hu,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	herbert@...dor.apana.org.au, penberg@...helsinki.fi,
	akpm@...ux-foundation.org, linux-ext4@...r.kernel.org,
	paulmck@...ux.vnet.ibm.com, rjw@...k.pl, zdenek.kabelac@...il.com,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC 1/1] mm: add virt to phys debug

On 05/01/2008 10:18 PM, Christoph Lameter wrote:
> On Thu, 1 May 2008, Jiri Slaby wrote:
>> Add some (configurable) expensive sanity checking to catch wrong address
>> translations on x86.
>>
>> - create linux/mmdebug.h file to be able include this file in
>>   asm headers to not get unsolvable loops in header files
>> - __phys_addr on x86_32 became a function in ioremap.c since
>>   PAGE_OFFSET and is_vmalloc_addr is undefined if declared in
>>   page_32.h (again circular dependencies)
>> - add __phys_addr_const for initializing doublefault_tss.__cr3
> 
> Hmmm.. We could use include/linux/bounds.h to make 
> VMALLOC_START/VMALLOC_END (or whatever you need for checking the memory 
> boundaries) a cpp constant which may allow the use in page_32.h without 
> circular dependencies.

I like the idea, I'll get back with a patch in few days (sorry, too busy). 
Anyway bounds.h should be include/asm/ thing though.
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