linux-kernel - [PATCH] bitops.h: use BITS_PER_LONG to simplify BITS_TO

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Date:   Sat, 18 Mar 2017 08:37:43 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     shli@...com, neilb@...e.com
Cc:     linux-kernel@...r.kernel.org, Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH] bitops.h: use BITS_PER_LONG to simplify BITS_TO_LONGS

The second parameter is the number of bits for type "long", which is
already defined in header file.

This patch replace the calculation with macro to make it more readable.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 include/linux/bitops.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index a83c822c35c2..923fe72d31e3 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -10,7 +10,7 @@
 #define BIT_ULL_MASK(nr)	(1ULL << ((nr) % BITS_PER_LONG_LONG))
 #define BIT_ULL_WORD(nr)	((nr) / BITS_PER_LONG_LONG)
 #define BITS_PER_BYTE		8
-#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_LONG)
 #endif
 
 /*
-- 
2.11.0