set_phys_avail() futures question

Kumar Gala kumar.gala at
Thu Jun 30 15:26:15 EST 2005

>>>> I'd like to get your opinion on what the future of
>>>> arch/ppc/mm/init.c/set_phys_avail() looks like.
>>>> Currently, its job is to traverse the mem_pieces data
>>>> and remove a whole series of #ifdef'ed regions of
>>>> memory based on configuration options.  These regions
>>>> are the initrd, the RTAS data, and the AGP special page.
>>>> Do you see these regions as being explicitly listed in
>>>> the proposed  "reserved memory blocks" area of the Flat
>>>> Dev Tree header structure?
>>> Yes. initrd for sure, RTAS too, AGP special page well ... I have to
>>> check if we still use that one at all... but it's not allocated in
>>> prom_init so it may need it's own little bit here still.
>> What this implies to me is that what a flattened OF tree we will no
>> longer need to call set_phys_avail().
> It will have to do some equivalent to transfer the reserve map to
> mem_pieces tho ...

Agreed, but I think we expect that to happen in platform_init now.   
When we walk the flatten tree we will build up the phys_avail  
mem_pieces data structure.

- kumar

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