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Subject[PATCH]: Bug in MM_RB debugging?
From

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@davemloft.net>

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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