linux-kernel - [PATCH 1/4] math64: add div64

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Date:	Thu,  6 Jun 2013 21:30:09 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	akpm@...ux-foundation.org
Cc:	sgruszka@...hat.com, fweisbec@...il.com, alex.shi@...el.com,
	mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] math64: add div64_ul

There are div64_long() to handle the s64/long division. But no
micro do u64/ul division in kernel.
It is necessary on some scenarios. So add this function.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 include/linux/math64.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index b8ba855..f0afe9c 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -7,6 +7,7 @@
 #if BITS_PER_LONG == 64
 
 #define div64_long(x,y) div64_s64((x),(y))
+#define div64_ul(x,y)   div64_u64((x),(y))
 
 /**
  * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
@@ -48,6 +49,7 @@ static inline s64 div64_s64(s64 dividend, s64 divisor)
 #elif BITS_PER_LONG == 32
 
 #define div64_long(x,y) div_s64((x),(y))
+#define div64_ul(x,y)   div_u64((x),(y))
 
 #ifndef div_u64_rem
 static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
-- 
1.7.5.4

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