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crc32: use __BYTE_ORDER macro for endian detection.

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Since crc32.c contains a nifty test program that can be executed in user
space, make sure endian detection works reliably in user space too.

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>
This commit is contained in:
Joakim Tjernlund 2010-05-24 14:33:31 -07:00 committed by Linus Torvalds
parent 836e2af925
commit 4762bbc1a3
1 changed files with 1 additions and 1 deletions
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2
lib/crc32.c
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@ -50,7 +50,7 @@ MODULE_LICENSE("GPL");
static inline u32 static inline u32
crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
{ {
# ifdef __LITTLE_ENDIAN # if __BYTE_ORDER == __LITTLE_ENDIAN
# define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8) # define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8)
# define DO_CRC4 crc = tab[3][(crc) & 255] ^ \ # define DO_CRC4 crc = tab[3][(crc) & 255] ^ \
tab[2][(crc >> 8) & 255] ^ \ tab[2][(crc >> 8) & 255] ^ \