x86, hash: Swap arguments passed to crc32_u32()

... to match the function's parameters. While reportedly commutative,
using the proper order allows for leveraging the instruction permitting
the source operand to be in memory.

[ hpa: This code originated in the dpdk toolkit.  This was a bug in dpdk
  which has recently been fixed in part due to an earlier version of
  this patch. ]

Signed-off-by: Jan Beulich <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Acked-by: Daniel Borkmann <[email protected]>
Cc: Francesco Fusco <[email protected]>
Cc: Thomas Graf <[email protected]>
Cc: David S. Miller <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>

Author: jbeulich

arch/x86/lib/hash.c

@@ -53,7 +53,7 @@ static u32 intel_crc4_2_hash(const void *data, u32 len, u32 seed)
 	u32 i, tmp = 0;
 
 	for (i = 0; i < len / 4; i++)
-		seed = crc32_u32(*p32++, seed);
+		seed = crc32_u32(seed, *p32++);
 
 	switch (3 - (len & 0x03)) {
 	case 0:
@@ -64,7 +64,7 @@ static u32 intel_crc4_2_hash(const void *data, u32 len, u32 seed)
 		/* fallthrough */
 	case 2:
 		tmp |= *((const u8 *) p32);
-		seed = crc32_u32(tmp, seed);
+		seed = crc32_u32(seed, tmp);
 	default:
 		break;
 	}
@@ -78,7 +78,7 @@ static u32 intel_crc4_2_hash2(const u32 *data, u32 len, u32 seed)
 	u32 i;
 
 	for (i = 0; i < len; i++)
-		seed = crc32_u32(*p32++, seed);
+		seed = crc32_u32(seed, *p32++);
 
 	return seed;
 }