From b951bf2c4693bfc9744e11293be859209f65f579 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Tue, 24 May 2011 17:11:23 -0700 Subject: 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 Acked-by: Greg Ungerer Cc: David Howells Cc: Paul Mundt Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/nommu.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'mm/nommu.c') diff --git a/mm/nommu.c b/mm/nommu.c index 0b16cb4c517..2454d39dc06 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; } -- cgit v1.2.3-18-g5258