linux-kernel - [PATCH 1/5] mm/vmalloc.c: correct a few logic error for __insert_vmap

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Date:   Wed, 21 Sep 2016 12:23:48 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, zijun_hu@....com,
        tj@...nel.org, mingo@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, mgorman@...hsingularity.net
Subject: [PATCH 1/5] mm/vmalloc.c: correct a few logic error for
 __insert_vmap_area()

From: zijun_hu <zijun_hu@....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_hu@....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