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SubjectRe: [RFC] Tight check of pfn_valid on sparsemem
On Tue, 13 Jul 2010 16:34:17 +0900
KAMEZAWA Hiroyuki <> wrote:

> Anyway, sparsemem is designed to be aligned to SECTION_SIZE of memmap.
> Please avoid adding new Spaghetti code without proper configs.
> Thanks,

Ok, I realized I misunderstand all. Arm doesn't unmap memmap but reuse the page
for memmap without modifing ptes. My routine only works when ARM uses sparsemem_vmemmap.
But yes, it isn't.

Hmm...How about using pfn_valid() for FLATMEM or avoid using SPARSEMEM ?
If you want conrols lower than SPARSEMEM, FLATMEM works better because ARM unmaps memmap.
What is the reason for SPARSEMEM ?


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