On Wed, 21 Sep 2016, zijun_hu wrote:

> From: zijun_hu <zijun...@htc.com>
> correct a few logic error for __insert_vmap_area() since the else
> if condition is always true and meaningless
> in order to fix this issue, if vmap_area inserted is lower than one
> on rbtree then walk around left branch; if higher then right branch
> otherwise intersects with the other then BUG_ON() is triggered

Under normal operation, you're right that the "else if" conditional should 
always succeed: we don't want to BUG() unless there's a bug.  The original 
code can catch instances when va->va_start == tmp_va->va_end where we 
should BUG().  Your code silently ignores it.

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