@@ -281,6 +281,28 @@ static inline int parity32(u32 val)
return (0x6996 >> (val & 0xf)) & 1;
}
+/**
+ * parity64 - get the parity of an u64 value
+ * @value: the value to be examined
+ *
+ * Determine the parity of the u64 argument.
+ *
+ * Returns:
+ * 0 for even parity, 1 for odd parity
+ */
+static inline int parity64(u64 val)
+{
+ /*
+ * One explanation of this algorithm:
+ * https://funloop.org/codex/problem/parity/README.html
+ */
+ val ^= val >> 32;
+ val ^= val >> 16;
+ val ^= val >> 8;
+ val ^= val >> 4;
+ return (0x6996 >> (val & 0xf)) & 1;
+}
+
/**
* __ffs64 - find first set bit in a 64 bit word
* @word: The 64 bit word