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authorJoakim Tjernlund <Joakim.Tjernlund@transmode.se>2010-03-05 13:43:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:45 -0800
commit4f2a9463d18517a9839401c3de6419ee1435875b (patch)
treefa19722c8b1a214ef269cb210f73d9c8a35e88da /lib/crc32.c
parent5e79d96eed306a8b4af67b3f35f6867edfabeebc (diff)
crc32: some minor cleanups
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/crc32.c')
-rw-r--r--lib/crc32.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/lib/crc32.c b/lib/crc32.c
index 02e3b31b3a79..0f45fbff34cb 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -30,11 +30,15 @@
#include <asm/atomic.h>
#include "crc32defs.h"
#if CRC_LE_BITS == 8
-#define tole(x) __constant_cpu_to_le32(x)
-#define tobe(x) __constant_cpu_to_be32(x)
+# define tole(x) __constant_cpu_to_le32(x)
#else
-#define tole(x) (x)
-#define tobe(x) (x)
+# define tole(x) (x)
+#endif
+
+#if CRC_BE_BITS == 8
+# define tobe(x) __constant_cpu_to_be32(x)
+#else
+# define tobe(x) (x)
#endif
#include "crc32table.h"
@@ -52,20 +56,19 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab)
# else
# define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
# endif
- const u32 *b = (const u32 *)buf;
+ const u32 *b;
size_t rem_len;
/* Align it */
- if (unlikely((long)b & 3 && len)) {
- u8 *p = (u8 *)b;
+ if (unlikely((long)buf & 3 && len)) {
do {
- DO_CRC(*p++);
- } while ((--len) && ((long)p)&3);
- b = (u32 *)p;
+ DO_CRC(*buf++);
+ } while ((--len) && ((long)buf)&3);
}
rem_len = len & 3;
/* load data 32 bits wide, xor data 32 bits wide. */
len = len >> 2;
+ b = (const u32 *)buf;
for (--b; len; --len) {
crc ^= *++b; /* use pre increment for speed */
DO_CRC(0);
@@ -82,6 +85,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab)
} while (--len);
}
return crc;
+#undef DO_CRC
}
#endif
/**
@@ -119,9 +123,6 @@ u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
crc = __cpu_to_le32(crc);
crc = crc32_body(crc, p, len, tab);
return __le32_to_cpu(crc);
-#undef ENDIAN_SHIFT
-#undef DO_CRC
-
# elif CRC_LE_BITS == 4
while (len--) {
crc ^= *p++;
@@ -179,9 +180,6 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
crc = __cpu_to_be32(crc);
crc = crc32_body(crc, p, len, tab);
return __be32_to_cpu(crc);
-#undef ENDIAN_SHIFT
-#undef DO_CRC
-
# elif CRC_BE_BITS == 4
while (len--) {
crc ^= *p++ << 24;

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