does pmd_offset return the physical address or virtual address of the page table?

["P.F. Tsai \(ACS\)" <pf_tsai@xxxxxxxxxx>]

冰河Hi all,

here is its definition in asm-i386

#define pmd_offset(dir, address) ((pmd_t *) pgd_page(*(dir)) +
pmd_index(address))

and here are the some other relative macros:

#define pgd_page(pgd)  ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
#define pmd_index(address)  (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

I think it is OBVIOUSLY virtual address but Mel Gorman (
http://kerneltrap.org/node/3790 ) seems to tell me that is a physical
address (chapter 3. page 34), I am confused with this issue, any one make me
a clear point of it please ?

thx a lot, everyone!

Tsai


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