46a82b2d55
One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
38 lines
1 KiB
C
38 lines
1 KiB
C
#ifndef _4LEVEL_FIXUP_H
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#define _4LEVEL_FIXUP_H
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#define __ARCH_HAS_4LEVEL_HACK
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#define __PAGETABLE_PUD_FOLDED
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#define PUD_SIZE PGDIR_SIZE
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#define PUD_MASK PGDIR_MASK
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#define PTRS_PER_PUD 1
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#define pud_t pgd_t
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#define pmd_alloc(mm, pud, address) \
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((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
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NULL: pmd_offset(pud, address))
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#define pud_alloc(mm, pgd, address) (pgd)
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#define pud_offset(pgd, start) (pgd)
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#define pud_none(pud) 0
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#define pud_bad(pud) 0
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#define pud_present(pud) 1
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#define pud_ERROR(pud) do { } while (0)
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#define pud_clear(pud) pgd_clear(pud)
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#define pud_val(pud) pgd_val(pud)
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#define pud_populate(mm, pud, pmd) pgd_populate(mm, pud, pmd)
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#define pud_page(pud) pgd_page(pud)
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#define pud_page_vaddr(pud) pgd_page_vaddr(pud)
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#undef pud_free_tlb
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#define pud_free_tlb(tlb, x) do { } while (0)
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#define pud_free(x) do { } while (0)
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#define __pud_free_tlb(tlb, x) do { } while (0)
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#undef pud_addr_end
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#define pud_addr_end(addr, end) (end)
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#endif
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