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| author | David Sterba <dsterba@suse.cz> | 2010-11-24 12:57:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-25 06:50:46 +0900 |
| commit | 5f0af70a25593a9d53b87bc8d31902fb7cc63e40 (patch) | |
| tree | 0abf2f2994398ac2ec11209ba9edc3b433622b3f /mm/pagewalk.c | |
| parent | e9959f0f37160e1f5351af828cc981712b5066c1 (diff) | |
| download | lwn-5f0af70a25593a9d53b87bc8d31902fb7cc63e40.tar.gz lwn-5f0af70a25593a9d53b87bc8d31902fb7cc63e40.zip | |
mm: remove call to find_vma in pagewalk for non-hugetlbfs
Commit d33b9f45 ("mm: hugetlb: fix hugepage memory leak in
walk_page_range()") introduces a check if a vma is a hugetlbfs one and
later in 5dc37642 ("mm hugetlb: add hugepage support to pagemap") it is
moved under #ifdef CONFIG_HUGETLB_PAGE but a needless find_vma call is
left behind and its result is not used anywhere else in the function.
The side-effect of caching vma for @addr inside walk->mm is neither
utilized in walk_page_range() nor in called functions.
Signed-off-by: David Sterba <dsterba@suse.cz>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Matt Mackall <mpm@selenic.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/pagewalk.c')
| -rw-r--r-- | mm/pagewalk.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 8b1a2ce21ee5..38cc58b8b2b0 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -139,7 +139,6 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd_t *pgd; unsigned long next; int err = 0; - struct vm_area_struct *vma; if (addr >= end) return err; @@ -149,15 +148,17 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, addr); do { + struct vm_area_struct *uninitialized_var(vma); + next = pgd_addr_end(addr, end); +#ifdef CONFIG_HUGETLB_PAGE /* * handle hugetlb vma individually because pagetable walk for * the hugetlb page is dependent on the architecture and * we can't handled it in the same manner as non-huge pages. */ vma = find_vma(walk->mm, addr); -#ifdef CONFIG_HUGETLB_PAGE if (vma && is_vm_hugetlb_page(vma)) { if (vma->vm_end < next) next = vma->vm_end; |