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Diffstat (limited to 'arch/i386/mm/hugetlbpage.c')
-rw-r--r--arch/i386/mm/hugetlbpage.c27
1 files changed, 11 insertions, 16 deletions
diff --git a/arch/i386/mm/hugetlbpage.c b/arch/i386/mm/hugetlbpage.c
index 3b099f32b94..d524127c9af 100644
--- a/arch/i386/mm/hugetlbpage.c
+++ b/arch/i386/mm/hugetlbpage.c
@@ -22,12 +22,15 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
- pmd_t *pmd = NULL;
+ pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
- pmd = pmd_alloc(mm, pud, addr);
- return (pte_t *) pmd;
+ if (pud)
+ pte = (pte_t *) pmd_alloc(mm, pud, addr);
+ BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));
+
+ return pte;
}
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
@@ -37,8 +40,11 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
pmd_t *pmd = NULL;
pgd = pgd_offset(mm, addr);
- pud = pud_offset(pgd, addr);
- pmd = pmd_offset(pud, addr);
+ if (pgd_present(*pgd)) {
+ pud = pud_offset(pgd, addr);
+ if (pud_present(*pud))
+ pmd = pmd_offset(pud, addr);
+ }
return (pte_t *) pmd;
}
@@ -118,17 +124,6 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
}
#endif
-void hugetlb_clean_stale_pgtable(pte_t *pte)
-{
- pmd_t *pmd = (pmd_t *) pte;
- struct page *page;
-
- page = pmd_page(*pmd);
- pmd_clear(pmd);
- dec_page_state(nr_page_table_pages);
- page_cache_release(page);
-}
-
/* x86_64 also uses this file */
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA