From: Eric Dumazet <redacted>
Date: Mon, 11 May 2015 21:56:46 -0700

On Mon, 2015-05-11 at 20:26 -0700, Tom Herbert wrote:

 ...

This (2) is not a multiple of 4, so some arches will have unaligned word
accesses ?

 ...

quoted

-static __always_inline u32 __flow_hash_3words(u32 a, u32 b, u32 c, u32 keyval)
+static __always_inline u32 __flow_hash_words(u32 *words, u32 length, u32 keyval)
 {
-	return jhash_3words(a, b, c, keyval);
+	return jhash2(words, length, keyval);
+}
+

-> crash or very slow on MIPS.

Yeah you really can't do this.  You must only pass 4-byte aligned items
into the hash function.