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Subject2.4.3-pre7 and p*_alloc

I'm looking at re-implementing the ARM page table allocation macros
required for 2.4.3-pre7, and have found the following:

pte_t *pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
if (!pmd_present(*pmd)) {

Why do we use pmd_present here instead of pmd_none? The same question
applies to __pmd_alloc.

Russell King ( The developer of ARM Linux

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