1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/hash.h b/include/linux/hash.h
index bd1754c7ecef..d0494c399392 100644
--- a/include/linux/hash.h
+++ b/include/linux/hash.h
@@ -37,6 +37,9 @@ static __always_inline u64 hash_64(u64 val, unsigned int bits)
 {
         u64 hash = val;
 
+#if defined(CONFIG_ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64
+        hash = hash * GOLDEN_RATIO_PRIME_64;
+#else
         /*  Sigh, gcc can't optimise this alone like it does for 32 bits. */
         u64 n = hash;
         n <<= 18;
@@ -51,6 +54,7 @@ static __always_inline u64 hash_64(u64 val, unsigned int bits)
         hash += n;
         n <<= 2;
         hash += n;
+#endif
 
         /* High bits are more random, so use them. */
         return hash >> (64 - bits);