On Tue, 2011-10-18 at 10:26 -0700, Michal Nazarewicz wrote:
> > You can do this in a more general fashion by checking the
> > zone boundaries and resolving the pfn->page every MAX_ORDER_NR_PAGES.
> > That will not be SPARSEMEM specific.
>
> I've tried doing stuff that way but it ended up with much more code.
I guess instead of:
>> +static inline bool zone_pfn_same_memmap(unsigned long pfn1, unsigned long pfn2)
>> +{
>> + return pfn_to_section_nr(pfn1) == pfn_to_section_nr(pfn2);
>> +}
You could do:
static inline bool zone_pfn_same_maxorder(unsigned long pfn1, unsigned long pfn2)
{
unsigned long mask = MAX_ORDER_NR_PAGES-1;
return (pfn1 & mask) == (pfn2 & mask);
}
I think that works. Should be the same code you have now, basically.
-- Dave
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