From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200509032256.j83Mud0B023224@shell0.pdx.osdl.net> Subject: [patch 040/220] hugetlb: check p?d_present in huge_pte_offset() From: akpm@osdl.org Date: Sat, 03 Sep 2005 15:55:01 -0700 Sender: owner-linux-mm@kvack.org Return-Path: To: torvalds@osdl.org Cc: akpm@osdl.org, agl@us.ibm.com, linux-mm@kvack.org List-ID: From: Adam Litke 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 Cc: Signed-off-by: Andrew Morton --- 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 --- devel/arch/i386/mm/hugetlbpage.c~hugetlb-check-pd_present-in-huge_pte_offset 2005-09-03 15:46:14.000000000 -0700 +++ devel-akpm/arch/i386/mm/hugetlbpage.c 2005-09-03 15:52:25.000000000 -0700 @@ -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; } _ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org