Add some functions to math64.h in the LinuxKPI, and fix nearby style.

Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11535

sys/compat/linuxkpi/common/include/linux/math64.h

@@ -26,6 +26,7 @@
  *
  * $FreeBSD$
  */
+
 #ifndef _LINUX_MATH64_H
 #define	_LINUX_MATH64_H
 
@@ -39,17 +40,48 @@
 	__rem;					\
 })
 
+static inline uint64_t
+div64_u64_rem(uint64_t dividend, uint64_t divisor, uint64_t *remainder)
+{
+
+	*remainder = dividend % divisor;
+	return (dividend / divisor);
+}
+
+static inline int64_t
+div64_s64(int64_t dividend, int64_t divisor)
+{
+
+	return (dividend / divisor);
+}
+
+static inline uint64_t
+div64_u64(uint64_t dividend, uint64_t divisor)
+{
+
+	return (dividend / divisor);
+}
+
 static inline uint64_t
 div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder)
 {
+
 	*remainder = dividend % divisor;
 	return (dividend / divisor);
 }
 
+static inline int64_t
+div_s64(int64_t dividend, int32_t divisor)
+{
+
+	return (dividend / divisor);
+}
+
 static inline uint64_t
 div_u64(uint64_t dividend, uint32_t divisor)
 {
+
 	return (dividend / divisor);
 }
 
-#endif					/* _LINUX_MATH64_H */
+#endif /* _LINUX_MATH64_H */