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

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Date:	Tue, 13 May 2008 16:38:51 +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, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC 1/1] mm: add virt to phys debug

Christoph Lameter napsal(a):
> 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.

Hrm, not that easy. I ended up in splitting fixmap_32.h (VMALLOC constants 
depends on it on 32-bit), moving around constants from over all the tree 
(NR_CPUS, FIX_ACPI_PAGES...) to not include files which would create loops, 
but still not having e.g. PMD_MASK available on all configurations. I think 
it's not worth it. Objections to merging the patch as was 
(http://lkml.org/lkml/2008/5/1/300)?

Thanks.
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