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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-20 16:24:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-21 08:49:21 -0700
commit297c5eee372478fc32fec5fe8eed711eedb13f3d (patch)
tree18415eae0833ff4767943f985900524d6b1d73f1 /mm/nommu.c
parent36423a5ed5e4ea95ceedb68fad52965033e11639 (diff)
downloadvexpress-lsk-297c5eee372478fc32fec5fe8eed711eedb13f3d.tar.gz
mm: make the vma list be doubly linked
It's a really simple list, and several of the users want to go backwards in it to find the previous vma. So rather than have to look up the previous entry with 'find_vma_prev()' or something similar, just make it doubly linked instead. Tested-by: Ian Campbell <ijc@hellion.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index efa9a380335..88ff091eb07 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -604,7 +604,7 @@ static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
*/
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
{
- struct vm_area_struct *pvma, **pp;
+ struct vm_area_struct *pvma, **pp, *next;
struct address_space *mapping;
struct rb_node **p, *parent;
@@ -664,8 +664,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
break;
}
- vma->vm_next = *pp;
+ next = *pp;
*pp = vma;
+ vma->vm_next = next;
+ if (next)
+ next->vm_prev = vma;
}
/*