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Date
SubjectRe: 2.6.17-mm1
From
Mel Gorman wrote:
> On Thu, 22 Jun 2006, Franck Bui-Huu wrote:
>>
>> Should ARCH_PFN_OFFSET macro be used instead in order to make pfn/page
>> convertions work when node 0 start offset do not start at 0 ?
>>
>
> What happens if you have ARCH_PFN_OFFSET as
>
> #define ARCH_PFN_OFFSET (0UL)
>
> ?

It's the default value (see memory_model.h). It means that pfn start
for node 0 is 0, therefore your physical memory address starts at 0.

>
> What arch is this?
>

well I'm working on MIPS, but you can take a look at ARM that does the
same thing better...

>> My physical memory start at 0x20000000. So node 0 starts at an offset
>> different from 0. I setup ARCH_PFN_OFFSET this way
>>
>> #define ARCH_PFN_OFFSET (0x20000000 << PAGE_SHIFT)
>>
>
> If physical memory starts at 0x20000000, why is the PFN not
> 0x20000000 >> PAGE_SHIFT ?
>

It is a typo...

Franck

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