--- linux-2.6.14-rc2-mm1/include/linux/jiffies.h	Thu Sep 29 23:04:49 2005
+++ linux-2.6.14-rc2-mm1-jiffies2/include/linux/jiffies.h	Sat Oct  1 19:12:13 2005
@@ -246,6 +246,37 @@
 
 #endif
 
+
+/*
+ * We define MAX_MSEC_OFFSET and MAX_USEC_OFFSET as maximal values that can be
+ * accepted by msecs_to_jiffies() and usec_to_jiffies() respectively, without
+ * risking a multiply overflow. Those functions return MAX_JIFFY_OFFSET for
+ * arguments above those values.
+ */
+
+#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
+#  define MAX_MSEC_OFFSET \
+	(ULONG_MAX - (MSEC_PER_SEC / HZ) + 1)
+#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
+#  define MAX_MSEC_OFFSET \
+	(ULONG_MAX / (HZ / MSEC_PER_SEC))
+#else
+#  define MAX_MSEC_OFFSET \
+	((ULONG_MAX - (MSEC_PER_SEC - 1)) / HZ)
+#endif
+
+#if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
+#  define MAX_USEC_OFFSET \
+	(ULONG_MAX - (USEC_PER_SEC / HZ) + 1)
+#elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
+#  define MAX_USEC_OFFSET \
+	(ULONG_MAX / (HZ / USEC_PER_SEC))
+#else
+#  define MAX_USEC_OFFSET \
+	((ULONG_MAX - (USEC_PER_SEC - 1)) / HZ)
+#endif
+
+
 /*
  * Convert jiffies to milliseconds and back.
  *
@@ -276,27 +307,29 @@
 
 static inline unsigned long msecs_to_jiffies(const unsigned int m)
 {
-	if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
+	if (MAX_MSEC_OFFSET < UINT_MAX && m > (unsigned int)MAX_MSEC_OFFSET)
 		return MAX_JIFFY_OFFSET;
 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
-	return (m + (MSEC_PER_SEC / HZ) - 1) / (MSEC_PER_SEC / HZ);
+	return ((unsigned long)m + (MSEC_PER_SEC / HZ) - 1) /
+		(MSEC_PER_SEC / HZ);
 #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
-	return m * (HZ / MSEC_PER_SEC);
+	return (unsigned long)m * (HZ / MSEC_PER_SEC);
 #else
-	return (m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
+	return ((unsigned long)m * HZ + MSEC_PER_SEC - 1) / MSEC_PER_SEC;
 #endif
 }
 
 static inline unsigned long usecs_to_jiffies(const unsigned int u)
 {
-	if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
+	if (MAX_USEC_OFFSET < UINT_MAX && u > (unsigned int)MAX_USEC_OFFSET)
 		return MAX_JIFFY_OFFSET;
 #if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
-	return (u + (USEC_PER_SEC / HZ) - 1) / (USEC_PER_SEC / HZ);
+	return ((unsigned long)u + (USEC_PER_SEC / HZ) - 1) /
+		(USEC_PER_SEC / HZ);
 #elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
-	return u * (HZ / USEC_PER_SEC);
+	return (unsigned long)u * (HZ / USEC_PER_SEC);
 #else
-	return (u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
+	return ((unsigned long)u * HZ + USEC_PER_SEC - 1) / USEC_PER_SEC;
 #endif
 }