From: Adam Litke <agl@us.ibm.com>
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.
Signed-off-by: Adam Litke <agl@us.ibm.com>
Cc: <linux-mm@kvack.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
arch/i386/mm/hugetlbpage.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff -puN arch/i386/mm/hugetlbpage.c~hugetlb-check-pd_present-in-huge_pte_offset arch/i386/mm/hugetlbpage.c
--- 25/arch/i386/mm/hugetlbpage.c~hugetlb-check-pd_present-in-huge_pte_offset Mon Aug 29 15:48:06 2005
+++ 25-akpm/arch/i386/mm/hugetlbpage.c Mon Aug 29 15:48:06 2005
@@ -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;
}
_