[patch 01/43] Move div_long_long_rem out of jiffies.h
From: Thomas Gleixner
Date: Wed Nov 30 2005 - 18:54:48 EST
plain text document attachment
(move-div-long-long-rem-out-of-jiffiesh.patch)
- move div_long_long_rem() from jiffies.h into a new calc64.h include file,
as it is a general math function useful for other things than the jiffy
code.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
include/linux/calc64.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/jiffies.h | 11 +----------
2 files changed, 47 insertions(+), 10 deletions(-)
Index: linux-2.6.15-rc2-rework/include/linux/calc64.h
===================================================================
--- /dev/null
+++ linux-2.6.15-rc2-rework/include/linux/calc64.h
@@ -0,0 +1,46 @@
+#ifndef _LINUX_CALC64_H
+#define _LINUX_CALC64_H
+
+#include <linux/types.h>
+#include <asm/div64.h>
+
+/*
+ * This is a generic macro which is used when the architecture
+ * specific div64.h does not provide a optimized one.
+ *
+ * The 64bit dividend is divided by the divisor (data type long), the
+ * result is returned and the remainder stored in the variable
+ * referenced by remainder (data type long *). In contrast to the
+ * do_div macro the dividend is kept intact.
+ */
+#ifndef div_long_long_rem
+#define div_long_long_rem(dividend,divisor,remainder) \
+({ \
+ u64 result = (dividend); \
+ \
+ *(remainder) = do_div(result, divisor); \
+ result; \
+})
+#endif
+
+/*
+ * Sign aware variation of the above. On some architectures a
+ * negative dividend leads to an divide overflow exception, which
+ * is avoided by the sign check.
+ */
+static inline long div_long_long_rem_signed(const long long dividend,
+ const long divisor,
+ long *remainder)
+{
+ long res;
+
+ if (unlikely(dividend < 0)) {
+ res = -div_long_long_rem(-dividend, divisor, remainder);
+ *remainder = -(*remainder);
+ } else
+ res = div_long_long_rem(dividend, divisor, remainder);
+
+ return res;
+}
+
+#endif
Index: linux-2.6.15-rc2-rework/include/linux/jiffies.h
===================================================================
--- linux-2.6.15-rc2-rework.orig/include/linux/jiffies.h
+++ linux-2.6.15-rc2-rework/include/linux/jiffies.h
@@ -1,21 +1,12 @@
#ifndef _LINUX_JIFFIES_H
#define _LINUX_JIFFIES_H
+#include <linux/calc64.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <asm/param.h> /* for HZ */
-#include <asm/div64.h>
-
-#ifndef div_long_long_rem
-#define div_long_long_rem(dividend,divisor,remainder) \
-({ \
- u64 result = dividend; \
- *remainder = do_div(result,divisor); \
- result; \
-})
-#endif
/*
* The following defines establish the engineering parameters of the PLL
--
-
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