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| author | Adam Litke <agl@us.ibm.com> | 2005-09-03 15:55:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-09-05 00:05:46 -0700 |
| commit | 02b0ccef903e85673ead74ddb7c431f2f7ce183d (patch) | |
| tree | d359d49ef24f94a413e7dec69821645b42813921 /arch/i386/mm/hugetlbpage.c | |
| parent | 7bf07f3d4b4358aa6d99a26d7a0165f1e91c3fcc (diff) | |
| download | op-kernel-dev-02b0ccef903e85673ead74ddb7c431f2f7ce183d.zip op-kernel-dev-02b0ccef903e85673ead74ddb7c431f2f7ce183d.tar.gz | |
[PATCH] hugetlb: check p?d_present in huge_pte_offset()
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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/mm/hugetlbpage.c')
| -rw-r--r-- | arch/i386/mm/hugetlbpage.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/i386/mm/hugetlbpage.c b/arch/i386/mm/hugetlbpage.c index 57c486f..24c8a53 100644 --- a/arch/i386/mm/hugetlbpage.c +++ b/arch/i386/mm/hugetlbpage.c @@ -46,8 +46,11 @@ 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; } |
