After walking rb tree, if vma is determined, prev vma has to be determined
based on vma; and rb_prev should be considered only if no vma determined.
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
--- a/mm/mmap.c Fri Aug 3 07:38:10 2012
+++ b/mm/mmap.c Mon Aug 6 20:10:18 2012
@@ -385,9 +385,13 @@ find_vma_prepare(struct mm_struct *mm, u
}
}
- *pprev = NULL;
- if (rb_prev)
- *pprev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
+ if (vma) {
+ *pprev = vma->vm_prev;
+ } else {
+ *pprev = NULL;
+ if (rb_prev)
+ *pprev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
+ }
*rb_link = __rb_link;
*rb_parent = __rb_parent;
return vma;
--
--
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