linux-kernel - [PATCH] radix-tree: Use DIV_ROUND_UP instead of reimplementing its function

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Date:   Mon, 10 Sep 2018 15:35:00 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <mawilcox@...rosoft.com>, <jlayton@...nel.org>,
        <mgorman@...hsingularity.net>, <hannes@...xchg.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] radix-tree: Use DIV_ROUND_UP instead of reimplementing its function

DIV_ROUND_UP has implemented the code-opened function. Therefore, just
replace the implementation with DIV_ROUND_UP.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 include/linux/radix-tree.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 34149e8..2e507c6 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -75,7 +75,7 @@ static inline bool radix_tree_is_internal_node(void *ptr)
 #define RADIX_TREE_MAP_MASK	(RADIX_TREE_MAP_SIZE-1)
 
 #define RADIX_TREE_TAG_LONGS	\
-	((RADIX_TREE_MAP_SIZE + BITS_PER_LONG - 1) / BITS_PER_LONG)
+		DIV_ROUND_UP(RADIX_TREE_MAP_SIZE, BITS_PER_LONG)
 
 #define RADIX_TREE_INDEX_BITS  (8 /* CHAR_BIT */ * sizeof(unsigned long))
 #define RADIX_TREE_MAX_PATH (DIV_ROUND_UP(RADIX_TREE_INDEX_BITS, \
-- 
1.7.12.4