[PATCH]: Bug in MM_RB debugging?

[David Miller]

The code is seemingly trying to make sure that rb_next()
brings us to successive increasing vma entries.

But the two variables, prev and pend, used to perform these
checks, are never advanced.

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>

diff --git a/mm/mmap.c b/mm/mmap.c
index eb509ae..84f997d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -299,6 +299,8 @@ static int browse_rb(struct rb_root *root)
 			printk("vm_end %lx < vm_start %lx\n", vma->vm_end, vma->vm_start);
 		i++;
 		pn = nd;
+		prev = vma->vm_start;
+		pend = vma->vm_end;
 	}
 	j = 0;
 	for (nd = pn; nd; nd = rb_prev(nd)) {
-
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