5e5419734c
(with Martin Schwidefsky <schwidefsky@de.ibm.com>) The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as first argument. The free functions do not get the mm_struct argument. This is 1) asymmetrical and 2) to do mm related page table allocations the mm argument is needed on the free function as well. [kamalesh@linux.vnet.ibm.com: i386 fix] [akpm@linux-foundation.org: coding-syle fixes] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
#ifndef _PGTABLE_NOPMD_H
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#define _PGTABLE_NOPMD_H
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#ifndef __ASSEMBLY__
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#include <asm-generic/pgtable-nopud.h>
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#define __PAGETABLE_PMD_FOLDED
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/*
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* Having the pmd type consist of a pud gets the size right, and allows
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* us to conceptually access the pud entry that this pmd is folded into
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* without casting.
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*/
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typedef struct { pud_t pud; } pmd_t;
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#define PMD_SHIFT PUD_SHIFT
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#define PTRS_PER_PMD 1
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/*
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* The "pud_xxx()" functions here are trivial for a folded two-level
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* setup: the pmd is never bad, and a pmd always exists (as it's folded
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* into the pud entry)
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*/
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static inline int pud_none(pud_t pud) { return 0; }
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static inline int pud_bad(pud_t pud) { return 0; }
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static inline int pud_present(pud_t pud) { return 1; }
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static inline void pud_clear(pud_t *pud) { }
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#define pmd_ERROR(pmd) (pud_ERROR((pmd).pud))
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#define pud_populate(mm, pmd, pte) do { } while (0)
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/*
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* (pmds are folded into puds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pud(pudptr, pudval) set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
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static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
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{
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return (pmd_t *)pud;
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}
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#define pmd_val(x) (pud_val((x).pud))
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#define __pmd(x) ((pmd_t) { __pud(x) } )
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#define pud_page(pud) (pmd_page((pmd_t){ pud }))
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#define pud_page_vaddr(pud) (pmd_page_vaddr((pmd_t){ pud }))
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pud, so has no extra memory associated with it.
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*/
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#define pmd_alloc_one(mm, address) NULL
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#define pmd_free(mm, x) do { } while (0)
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#define __pmd_free_tlb(tlb, x) do { } while (0)
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#undef pmd_addr_end
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#define pmd_addr_end(addr, end) (end)
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#endif /* __ASSEMBLY__ */
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#endif /* _PGTABLE_NOPMD_H */
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