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-rw-r--r--mm/nommu.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 5afce48ce339..0b16cb4c517b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -680,9 +680,9 @@ 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, *next;
+ struct vm_area_struct *pvma, *prev;
struct address_space *mapping;
- struct rb_node **p, *parent;
+ struct rb_node **p, *parent, *rb_prev;
kenter(",%p", vma);
@@ -703,7 +703,7 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
}
/* add the VMA to the tree */
- parent = NULL;
+ parent = rb_prev = NULL;
p = &mm->mm_rb.rb_node;
while (*p) {
parent = *p;
@@ -713,17 +713,20 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
* (the latter is necessary as we may get identical VMAs) */
if (vma->vm_start < pvma->vm_start)
p = &(*p)->rb_left;
- else if (vma->vm_start > pvma->vm_start)
+ else if (vma->vm_start > pvma->vm_start) {
+ rb_prev = parent;
p = &(*p)->rb_right;
- else if (vma->vm_end < pvma->vm_end)
+ } else if (vma->vm_end < pvma->vm_end)
p = &(*p)->rb_left;
- else if (vma->vm_end > pvma->vm_end)
+ else if (vma->vm_end > pvma->vm_end) {
+ rb_prev = parent;
p = &(*p)->rb_right;
- else if (vma < pvma)
+ } else if (vma < pvma)
p = &(*p)->rb_left;
- else if (vma > pvma)
+ else if (vma > pvma) {
+ rb_prev = parent;
p = &(*p)->rb_right;
- else
+ } else
BUG();
}
@@ -731,20 +734,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
rb_insert_color(&vma->vm_rb, &mm->mm_rb);
/* add VMA to the VMA list also */
- for (pp = &mm->mmap; (pvma = *pp); pp = &(*pp)->vm_next) {
- if (pvma->vm_start > vma->vm_start)
- break;
- if (pvma->vm_start < vma->vm_start)
- continue;
- if (pvma->vm_end < vma->vm_end)
- break;
- }
+ prev = NULL;
+ if (rb_prev)
+ prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
- next = *pp;
- *pp = vma;
- vma->vm_next = next;
- if (next)
- next->vm_prev = vma;
+ __vma_link_list(mm, vma, prev, parent);
}
/*