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authorNamhyung Kim <namhyung@gmail.com>2011-05-24 17:11:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:05 -0700
commitb951bf2c4693bfc9744e11293be859209f65f579 (patch)
tree05f0bce8e2c2cd9053d761b17abc8101aab30a3e /mm/nommu.c
parent6038def0d11b322019d0dbb43f2a611247dfbdb6 (diff)
downloadlinux-b951bf2c4693bfc9744e11293be859209f65f579.tar.bz2
mm: nommu: don't scan the vma list when deleting
Since commit 297c5eee3724 ("mm: make the vma list be doubly linked") made it a doubly linked list, we don't need to scan the list when deleting @vma. And the original code didn't update the prev pointer. Fix it too. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Greg Ungerer <gerg@uclinux.org> Cc: David Howells <dhowells@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 0b16cb4c517b..2454d39dc068 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -746,7 +746,6 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
*/
static void delete_vma_from_mm(struct vm_area_struct *vma)
{
- struct vm_area_struct **pp;
struct address_space *mapping;
struct mm_struct *mm = vma->vm_mm;
@@ -769,12 +768,14 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
/* remove from the MM's tree and list */
rb_erase(&vma->vm_rb, &mm->mm_rb);
- for (pp = &mm->mmap; *pp; pp = &(*pp)->vm_next) {
- if (*pp == vma) {
- *pp = vma->vm_next;
- break;
- }
- }
+
+ if (vma->vm_prev)
+ vma->vm_prev->vm_next = vma->vm_next;
+ else
+ mm->mmap = vma->vm_next;
+
+ if (vma->vm_next)
+ vma->vm_next->vm_prev = vma->vm_prev;
vma->vm_mm = NULL;
}