From 5cca7619a562c9d98a3a0123dc878d79bf3c8fb3 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 9 Jan 2006 20:52:20 -0800
Subject: [PATCH] [PATCH] hrtimer: move div_long_long_rem out of jiffies.h

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.
Convert it to an inline function

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 include/linux/calc64.h  | 49 +++++++++++++++++++++++++++++++++++++++++
 include/linux/jiffies.h | 18 +++++----------
 2 files changed, 55 insertions(+), 12 deletions(-)
 create mode 100644 include/linux/calc64.h

diff --git a/include/linux/calc64.h b/include/linux/calc64.h
new file mode 100644
index 0000000000..ebf4b8f38d
--- /dev/null
+++ b/include/linux/calc64.h
@@ -0,0 +1,49 @@
+#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)	\
+	do_div_llr((dividend), divisor, remainder)
+
+static inline unsigned long do_div_llr(const long long dividend,
+				       const long divisor, long *remainder)
+{
+	u64 result = dividend;
+
+	*(remainder) = do_div(result, divisor);
+	return (unsigned long) 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
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 6acfdbba73..99905e1805 100644
--- a/include/linux/jiffies.h
+++ b/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
@@ -373,8 +364,11 @@ jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
 	 * one divide.
 	 */
 	u64 nsec = (u64)jiffies * TICK_NSEC;
-	value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_usec);
-	value->tv_usec /= NSEC_PER_USEC;
+	long tv_usec;
+
+	value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tv_usec);
+	tv_usec /= NSEC_PER_USEC;
+	value->tv_usec = tv_usec;
 }
 
 /*
-- 
2.39.5