diff options
Diffstat (limited to 'drivers/md/dm-vdo/murmurhash3.c')
| -rw-r--r-- | drivers/md/dm-vdo/murmurhash3.c | 33 |
1 files changed, 8 insertions, 25 deletions
diff --git a/drivers/md/dm-vdo/murmurhash3.c b/drivers/md/dm-vdo/murmurhash3.c index 00c9b9c05001..01d2743444ec 100644 --- a/drivers/md/dm-vdo/murmurhash3.c +++ b/drivers/md/dm-vdo/murmurhash3.c @@ -8,33 +8,14 @@ #include "murmurhash3.h" +#include <asm/unaligned.h> + static inline u64 rotl64(u64 x, s8 r) { return (x << r) | (x >> (64 - r)); } #define ROTL64(x, y) rotl64(x, y) -static __always_inline u64 getblock64(const u64 *p, int i) -{ -#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - return p[i]; -#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ - return __builtin_bswap64(p[i]); -#else -#error "can't figure out byte order" -#endif -} - -static __always_inline void putblock64(u64 *p, int i, u64 value) -{ -#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - p[i] = value; -#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ - p[i] = __builtin_bswap64(value); -#else -#error "can't figure out byte order" -#endif -} /* Finalization mix - force all bits of a hash block to avalanche */ @@ -60,6 +41,8 @@ void murmurhash3_128(const void *key, const int len, const u32 seed, void *out) const u64 c1 = 0x87c37b91114253d5LLU; const u64 c2 = 0x4cf5ad432745937fLLU; + u64 *hash_out = out; + /* body */ const u64 *blocks = (const u64 *)(data); @@ -67,8 +50,8 @@ void murmurhash3_128(const void *key, const int len, const u32 seed, void *out) int i; for (i = 0; i < nblocks; i++) { - u64 k1 = getblock64(blocks, i * 2 + 0); - u64 k2 = getblock64(blocks, i * 2 + 1); + u64 k1 = get_unaligned_le64(&blocks[i * 2]); + u64 k2 = get_unaligned_le64(&blocks[i * 2 + 1]); k1 *= c1; k1 = ROTL64(k1, 31); @@ -170,6 +153,6 @@ void murmurhash3_128(const void *key, const int len, const u32 seed, void *out) h1 += h2; h2 += h1; - putblock64((u64 *)out, 0, h1); - putblock64((u64 *)out, 1, h2); + put_unaligned_le64(h1, &hash_out[0]); + put_unaligned_le64(h2, &hash_out[1]); } |