42b88befd6
Quite a long time back, prepare_hugepage_range() replaced is_aligned_hugepage_range() as the callback from mm/mmap.c to arch code to verify if an address range is suitable for a hugepage mapping. is_aligned_hugepage_range() stuck around, but only to implement prepare_hugepage_range() on archs which didn't implement their own. Most archs (everything except ia64 and powerpc) used the same implementation of is_aligned_hugepage_range(). On powerpc, which implements its own prepare_hugepage_range(), the custom version was never used. In addition, "is_aligned_hugepage_range()" was a bad name, because it suggests it returns true iff the given range is a good hugepage range, whereas in fact it returns 0-or-error (so the sense is reversed). This patch cleans up by abolishing is_aligned_hugepage_range(). Instead prepare_hugepage_range() is defined directly. Most archs use the default version, which simply checks the given region is aligned to the size of a hugepage. ia64 and powerpc define custom versions. The ia64 one simply checks that the range is in the correct address space region in addition to being suitably aligned. The powerpc version (just as previously) checks for suitable addresses, and if necessary performs low-level MMU frobbing to set up new areas for use by hugepages. No libhugetlbfs testsuite regressions on ppc64 (POWER5 LPAR). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
/*
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* arch/sh64/mm/hugetlbpage.c
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*
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* SuperH HugeTLB page support.
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*
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* Cloned from sparc64 by Paul Mundt.
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*
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* Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <asm/mman.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pmd = pmd_alloc(mm, pgd, addr);
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if (pmd)
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pte = pte_alloc_map(mm, pmd, addr);
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}
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return pte;
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}
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pmd = pmd_offset(pgd, addr);
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if (pmd)
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pte = pte_offset_map(pmd, addr);
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}
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return pte;
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}
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t entry)
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{
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int i;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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set_pte_at(mm, addr, ptep, entry);
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ptep++;
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addr += PAGE_SIZE;
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pte_val(entry) += PAGE_SIZE;
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}
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_t entry;
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int i;
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entry = *ptep;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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pte_clear(mm, addr, ptep);
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addr += PAGE_SIZE;
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ptep++;
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}
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return entry;
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}
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struct page *follow_huge_addr(struct mm_struct *mm,
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unsigned long address, int write)
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{
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return ERR_PTR(-EINVAL);
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}
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int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write)
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{
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return NULL;
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}
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