The patch titled
mm: nommu: don't scan the vma list when deleting
has been removed from the -mm tree. Its filename was
mm-nommu-dont-scan-the-vma-list-when-deleting.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: nommu: don't scan the vma list when deleting
From: Namhyung Kim <namhyung@xxxxxxxxx>
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@xxxxxxxxx>
Acked-by: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/nommu.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff -puN mm/nommu.c~mm-nommu-dont-scan-the-vma-list-when-deleting mm/nommu.c
--- a/mm/nommu.c~mm-nommu-dont-scan-the-vma-list-when-deleting
+++ a/mm/nommu.c
@@ -746,7 +746,6 @@ static void add_vma_to_mm(struct mm_stru
*/
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
/* 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;
}
_
Patches currently in -mm which might be from namhyung@xxxxxxxxx are
origin.patch
memcg-mark-init_section_page_cgroup-properly.patch
memcg-fix-off-by-one-when-calculating-swap-cgroup-map-length.patch
memcg-move-page-freeing-code-out-of-lock.patch
maintainers-add-mm-page_cgroupc-into-memcg-subsystem.patch
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