[PATCH 1/5] mm/vmalloc.c: correct a few logic error for __insert_vmap_area()

[zijun_hu]

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

Signed-off-by: zijun_hu <zijun...@htc.com>
---
 mm/vmalloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 91f44e7..cc6ecd6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -321,10 +321,10 @@ static void __insert_vmap_area(struct vmap_area *va)
 
                parent = *p;
                tmp_va = rb_entry(parent, struct vmap_area, rb_node);
-               if (va->va_start < tmp_va->va_end)
-                       p = &(*p)->rb_left;
-               else if (va->va_end > tmp_va->va_start)
-                       p = &(*p)->rb_right;
+               if (va->va_end <= tmp_va->va_start)
+                       p = &parent->rb_left;
+               else if (va->va_start >= tmp_va->va_end)
+                       p = &parent->rb_right;
                else
                        BUG();
        }
-- 
1.9.1