1 files changed, 27 insertions, 0 deletions
diff --git a/backport-include/linux/math64.h b/backport-include/linux/math64.h
new file mode 100644
index 0000000..4aeb0df
--- /dev/null
+++ b/backport-include/linux/math64.h
@@ -0,0 +1,27 @@
+#ifndef __BACKPORT_LINUX_MATH64_H
+#define __BACKPORT_LINUX_MATH64_H
+#include_next <linux/math64.h>
+
+#if LINUX_VERSION_IS_LESS(3,12,0)
+
+#if BITS_PER_LONG == 64
+/**
+ * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
+ */
+#define div64_u64_rem LINUX_BACKPORT(div64_u64_rem)
+static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
+{
+	*remainder = dividend % divisor;
+	return dividend / divisor;
+}
+#elif BITS_PER_LONG == 32
+#ifndef div64_u64_rem
+#define div64_u64_rem LINUX_BACKPORT(div64_u64_rem)
+#define backports_div64_u64_rem_add 1
+extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder);
+#endif
+
+#endif /* BITS_PER_LONG */
+#endif /* < 3.12 */
+
+#endif /* __BACKPORT_LINUX_MATH64_H */