Initial Post (Wed, 17 Aug 2005)
For demand faulting, we cannot assume that the page tables will be populated.
Do what the rest of the architectures do and test p?d_present() while walking
down the page table.
Diffed against 2.6.13-rc6
Signed-off-by: Adam Litke <[email protected]>
---
hugetlbpage.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff -upN reference/arch/i386/mm/hugetlbpage.c current/arch/i386/mm/hugetlbpage.c
--- reference/arch/i386/mm/hugetlbpage.c
+++ current/arch/i386/mm/hugetlbpage.c
@@ -46,8 +46,11 @@ pte_t *huge_pte_offset(struct mm_struct
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;
}
-
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