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authorKen Raeburn <raeburn@redhat.com>2024-03-25 22:22:45 +0300
committerMike Snitzer <snitzer@kernel.org>2024-03-29 16:45:54 +0300
commitd7e1201443713f5addce2d9b4920d25391883a80 (patch)
treecde4a4e59bd4e9a0666e6254e1bdd207b8f9cb64 /drivers/md
parent309d8ced2d4865fffb839c13f604fc13f4ef4b31 (diff)
downloadlinux-d7e1201443713f5addce2d9b4920d25391883a80.tar.xz
dm vdo murmurhash3: use kernel byteswapping routines instead of GCC ones
Also open-code the calls. Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Ken Raeburn <raeburn@redhat.com> Signed-off-by: Matthew Sakai <msakai@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-vdo/murmurhash3.c33
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]);
}