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Commit 3863ef31 authored by Bob Pearson's avatar Bob Pearson Committed by Linus Torvalds
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crc32: simplify unit test code 

Replace the unit test provided in crc32.c, which doesn't have a makefile
and doesn't compile with current headers, with a simpler self test
routine that also gives a measure of performance and runs at module init
time.  The self test option can be enabled through a configuration
option CONFIG_CRC32_SELFTEST.

The test stresses the pre and post loops and is thus not very realistic
since actual uses will likely have addresses and lengths that are at
least 4 byte aligned.  However, the main loop is long enough so that the
performance is dominated by that loop.

The expected values for crc32_le and crc32_be were generated with the
original version of crc32.c using CRC_BITS_LE = 8 and CRC_BITS_BE = 8.
These values were then used to check all the values of the BITS
parameters in both the original and new versions.

The performance results show some variability from run to run in spite
of attempts to both warm the cache and reduce the amount of OS noise by
limiting interrutps during the test.  To get comparable results and to
analyse options wrt performance the best time reported over a small
sample of runs has been taken.

[djwong@us.ibm.com: Minor changelog tweaks]
Signed-off-by: default avatarBob Pearson <rpearson@systemfabricworks.com>
Signed-off-by: default avatarDarrick J. Wong <djwong@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fbedceb1
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Inline Side-by-side
Showing with 691 additions and 117 deletions
lib/Kconfig
View file @ 3863ef31
...@@ -70,6 +70,16 @@ config CRC32 ...@@ -70,6 +70,16 @@ config CRC32
kernel tree does. Such modules that use library CRC32 functions kernel tree does. Such modules that use library CRC32 functions
require M here. require M here.
config CRC32_SELFTEST
bool "CRC32 perform self test on init"
default n
depends on CRC32
help
This option enables the CRC32 library functions to perform a
self test on initialization. The self test computes crc32_le
and crc32_be over byte strings with random alignment and length
and computes the total elapsed time and number of bytes processed.
config CRC7 config CRC7
tristate "CRC7 functions" tristate "CRC7 functions"
help help
......
lib/crc32.c
View file @ 3863ef31
...@@ -211,137 +211,701 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) ...@@ -211,137 +211,701 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
EXPORT_SYMBOL(crc32_le); EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(crc32_be); EXPORT_SYMBOL(crc32_be);
#ifdef UNITTEST #ifdef CONFIG_CRC32_SELFTEST
#include <stdlib.h> /* 4096 random bytes */
#include <stdio.h> static u8 __attribute__((__aligned__(8))) test_buf[] =
#if 0 /*Not used at present */
static void
buf_dump(char const *prefix, unsigned char const *buf, size_t len)
{ {
fputs(prefix, stdout); 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
while (len--) 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
printf(" %02x", *buf++); 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
putchar('\n'); 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
} 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
#endif 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
static void bytereverse(unsigned char *buf, size_t len) 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d,
0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40,
0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b,
0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35,
0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40,
0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63,
0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b,
0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8,
0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72,
0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86,
0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff,
0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed,
0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c,
0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed,
0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30,
0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99,
0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4,
0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80,
0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37,
0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04,
0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e,
0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd,
0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c,
0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09,
0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb,
0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b,
0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53,
0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b,
0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f,
0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff,
0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40,
0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6,
0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb,
0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73,
0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f,
0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4,
0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66,
0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1,
0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80,
0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f,
0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5,
0xe4, 0x93, 0x05, 0x53, 0x4f, 0x84, 0x66, 0xa7,
0x58, 0x5c, 0x7b, 0x86, 0x52, 0x6d, 0x0d, 0xce,
0xa4, 0x30, 0x7d, 0xb6, 0x18, 0x9f, 0xeb, 0xff,
0x22, 0xbb, 0x72, 0x29, 0xb9, 0x44, 0x0b, 0x48,
0x1e, 0x84, 0x71, 0x81, 0xe3, 0x6d, 0x73, 0x26,
0x92, 0xb4, 0x4d, 0x2a, 0x29, 0xb8, 0x1f, 0x72,
0xed, 0xd0, 0xe1, 0x64, 0x77, 0xea, 0x8e, 0x88,
0x0f, 0xef, 0x3f, 0xb1, 0x3b, 0xad, 0xf9, 0xc9,
0x8b, 0xd0, 0xac, 0xc6, 0xcc, 0xa9, 0x40, 0xcc,
0x76, 0xf6, 0x3b, 0x53, 0xb5, 0x88, 0xcb, 0xc8,
0x37, 0xf1, 0xa2, 0xba, 0x23, 0x15, 0x99, 0x09,
0xcc, 0xe7, 0x7a, 0x3b, 0x37, 0xf7, 0x58, 0xc8,
0x46, 0x8c, 0x2b, 0x2f, 0x4e, 0x0e, 0xa6, 0x5c,
0xea, 0x85, 0x55, 0xba, 0x02, 0x0e, 0x0e, 0x48,
0xbc, 0xe1, 0xb1, 0x01, 0x35, 0x79, 0x13, 0x3d,
0x1b, 0xc0, 0x53, 0x68, 0x11, 0xe7, 0x95, 0x0f,
0x9d, 0x3f, 0x4c, 0x47, 0x7b, 0x4d, 0x1c, 0xae,
0x50, 0x9b, 0xcb, 0xdd, 0x05, 0x8d, 0x9a, 0x97,
0xfd, 0x8c, 0xef, 0x0c, 0x1d, 0x67, 0x73, 0xa8,
0x28, 0x36, 0xd5, 0xb6, 0x92, 0x33, 0x40, 0x75,
0x0b, 0x51, 0xc3, 0x64, 0xba, 0x1d, 0xc2, 0xcc,
0xee, 0x7d, 0x54, 0x0f, 0x27, 0x69, 0xa7, 0x27,
0x63, 0x30, 0x29, 0xd9, 0xc8, 0x84, 0xd8, 0xdf,
0x9f, 0x68, 0x8d, 0x04, 0xca, 0xa6, 0xc5, 0xc7,
0x7a, 0x5c, 0xc8, 0xd1, 0xcb, 0x4a, 0xec, 0xd0,
0xd8, 0x20, 0x69, 0xc5, 0x17, 0xcd, 0x78, 0xc8,
0x75, 0x23, 0x30, 0x69, 0xc9, 0xd4, 0xea, 0x5c,
0x4f, 0x6b, 0x86, 0x3f, 0x8b, 0xfe, 0xee, 0x44,
0xc9, 0x7c, 0xb7, 0xdd, 0x3e, 0xe5, 0xec, 0x54,
0x03, 0x3e, 0xaa, 0x82, 0xc6, 0xdf, 0xb2, 0x38,
0x0e, 0x5d, 0xb3, 0x88, 0xd9, 0xd3, 0x69, 0x5f,
0x8f, 0x70, 0x8a, 0x7e, 0x11, 0xd9, 0x1e, 0x7b,
0x38, 0xf1, 0x42, 0x1a, 0xc0, 0x35, 0xf5, 0xc7,
0x36, 0x85, 0xf5, 0xf7, 0xb8, 0x7e, 0xc7, 0xef,
0x18, 0xf1, 0x63, 0xd6, 0x7a, 0xc6, 0xc9, 0x0e,
0x4d, 0x69, 0x4f, 0x84, 0xef, 0x26, 0x41, 0x0c,
0xec, 0xc7, 0xe0, 0x7e, 0x3c, 0x67, 0x01, 0x4c,
0x62, 0x1a, 0x20, 0x6f, 0xee, 0x47, 0x4d, 0xc0,
0x99, 0x13, 0x8d, 0x91, 0x4a, 0x26, 0xd4, 0x37,
0x28, 0x90, 0x58, 0x75, 0x66, 0x2b, 0x0a, 0xdf,
0xda, 0xee, 0x92, 0x25, 0x90, 0x62, 0x39, 0x9e,
0x44, 0x98, 0xad, 0xc1, 0x88, 0xed, 0xe4, 0xb4,
0xaf, 0xf5, 0x8c, 0x9b, 0x48, 0x4d, 0x56, 0x60,
0x97, 0x0f, 0x61, 0x59, 0x9e, 0xa6, 0x27, 0xfe,
0xc1, 0x91, 0x15, 0x38, 0xb8, 0x0f, 0xae, 0x61,
0x7d, 0x26, 0x13, 0x5a, 0x73, 0xff, 0x1c, 0xa3,
0x61, 0x04, 0x58, 0x48, 0x55, 0x44, 0x11, 0xfe,
0x15, 0xca, 0xc3, 0xbd, 0xca, 0xc5, 0xb4, 0x40,
0x5d, 0x1b, 0x7f, 0x39, 0xb5, 0x9c, 0x35, 0xec,
0x61, 0x15, 0x32, 0x32, 0xb8, 0x4e, 0x40, 0x9f,
0x17, 0x1f, 0x0a, 0x4d, 0xa9, 0x91, 0xef, 0xb7,
0xb0, 0xeb, 0xc2, 0x83, 0x9a, 0x6c, 0xd2, 0x79,
0x43, 0x78, 0x5e, 0x2f, 0xe5, 0xdd, 0x1a, 0x3c,
0x45, 0xab, 0x29, 0x40, 0x3a, 0x37, 0x5b, 0x6f,
0xd7, 0xfc, 0x48, 0x64, 0x3c, 0x49, 0xfb, 0x21,
0xbe, 0xc3, 0xff, 0x07, 0xfb, 0x17, 0xe9, 0xc9,
0x0c, 0x4c, 0x5c, 0x15, 0x9e, 0x8e, 0x22, 0x30,
0x0a, 0xde, 0x48, 0x7f, 0xdb, 0x0d, 0xd1, 0x2b,
0x87, 0x38, 0x9e, 0xcc, 0x5a, 0x01, 0x16, 0xee,
0x75, 0x49, 0x0d, 0x30, 0x01, 0x34, 0x6a, 0xb6,
0x9a, 0x5a, 0x2a, 0xec, 0xbb, 0x48, 0xac, 0xd3,
0x77, 0x83, 0xd8, 0x08, 0x86, 0x4f, 0x48, 0x09,
0x29, 0x41, 0x79, 0xa1, 0x03, 0x12, 0xc4, 0xcd,
0x90, 0x55, 0x47, 0x66, 0x74, 0x9a, 0xcc, 0x4f,
0x35, 0x8c, 0xd6, 0x98, 0xef, 0xeb, 0x45, 0xb9,
0x9a, 0x26, 0x2f, 0x39, 0xa5, 0x70, 0x6d, 0xfc,
0xb4, 0x51, 0xee, 0xf4, 0x9c, 0xe7, 0x38, 0x59,
0xad, 0xf4, 0xbc, 0x46, 0xff, 0x46, 0x8e, 0x60,
0x9c, 0xa3, 0x60, 0x1d, 0xf8, 0x26, 0x72, 0xf5,
0x72, 0x9d, 0x68, 0x80, 0x04, 0xf6, 0x0b, 0xa1,
0x0a, 0xd5, 0xa7, 0x82, 0x3a, 0x3e, 0x47, 0xa8,
0x5a, 0xde, 0x59, 0x4f, 0x7b, 0x07, 0xb3, 0xe9,
0x24, 0x19, 0x3d, 0x34, 0x05, 0xec, 0xf1, 0xab,
0x6e, 0x64, 0x8f, 0xd3, 0xe6, 0x41, 0x86, 0x80,
0x70, 0xe3, 0x8d, 0x60, 0x9c, 0x34, 0x25, 0x01,
0x07, 0x4d, 0x19, 0x41, 0x4e, 0x3d, 0x5c, 0x7e,
0xa8, 0xf5, 0xcc, 0xd5, 0x7b, 0xe2, 0x7d, 0x3d,
0x49, 0x86, 0x7d, 0x07, 0xb7, 0x10, 0xe3, 0x35,
0xb8, 0x84, 0x6d, 0x76, 0xab, 0x17, 0xc6, 0x38,
0xb4, 0xd3, 0x28, 0x57, 0xad, 0xd3, 0x88, 0x5a,
0xda, 0xea, 0xc8, 0x94, 0xcc, 0x37, 0x19, 0xac,
0x9c, 0x9f, 0x4b, 0x00, 0x15, 0xc0, 0xc8, 0xca,
0x1f, 0x15, 0xaa, 0xe0, 0xdb, 0xf9, 0x2f, 0x57,
0x1b, 0x24, 0xc7, 0x6f, 0x76, 0x29, 0xfb, 0xed,
0x25, 0x0d, 0xc0, 0xfe, 0xbd, 0x5a, 0xbf, 0x20,
0x08, 0x51, 0x05, 0xec, 0x71, 0xa3, 0xbf, 0xef,
0x5e, 0x99, 0x75, 0xdb, 0x3c, 0x5f, 0x9a, 0x8c,
0xbb, 0x19, 0x5c, 0x0e, 0x93, 0x19, 0xf8, 0x6a,
0xbc, 0xf2, 0x12, 0x54, 0x2f, 0xcb, 0x28, 0x64,
0x88, 0xb3, 0x92, 0x0d, 0x96, 0xd1, 0xa6, 0xe4,
0x1f, 0xf1, 0x4d, 0xa4, 0xab, 0x1c, 0xee, 0x54,
0xf2, 0xad, 0x29, 0x6d, 0x32, 0x37, 0xb2, 0x16,
0x77, 0x5c, 0xdc, 0x2e, 0x54, 0xec, 0x75, 0x26,
0xc6, 0x36, 0xd9, 0x17, 0x2c, 0xf1, 0x7a, 0xdc,
0x4b, 0xf1, 0xe2, 0xd9, 0x95, 0xba, 0xac, 0x87,
0xc1, 0xf3, 0x8e, 0x58, 0x08, 0xd8, 0x87, 0x60,
0xc9, 0xee, 0x6a, 0xde, 0xa4, 0xd2, 0xfc, 0x0d,
0xe5, 0x36, 0xc4, 0x5c, 0x52, 0xb3, 0x07, 0x54,
0x65, 0x24, 0xc1, 0xb1, 0xd1, 0xb1, 0x53, 0x13,
0x31, 0x79, 0x7f, 0x05, 0x76, 0xeb, 0x37, 0x59,
0x15, 0x2b, 0xd1, 0x3f, 0xac, 0x08, 0x97, 0xeb,
0x91, 0x98, 0xdf, 0x6c, 0x09, 0x0d, 0x04, 0x9f,
0xdc, 0x3b, 0x0e, 0x60, 0x68, 0x47, 0x23, 0x15,
0x16, 0xc6, 0x0b, 0x35, 0xf8, 0x77, 0xa2, 0x78,
0x50, 0xd4, 0x64, 0x22, 0x33, 0xff, 0xfb, 0x93,
0x71, 0x46, 0x50, 0x39, 0x1b, 0x9c, 0xea, 0x4e,
0x8d, 0x0c, 0x37, 0xe5, 0x5c, 0x51, 0x3a, 0x31,
0xb2, 0x85, 0x84, 0x3f, 0x41, 0xee, 0xa2, 0xc1,
0xc6, 0x13, 0x3b, 0x54, 0x28, 0xd2, 0x18, 0x37,
0xcc, 0x46, 0x9f, 0x6a, 0x91, 0x3d, 0x5a, 0x15,
0x3c, 0x89, 0xa3, 0x61, 0x06, 0x7d, 0x2e, 0x78,
0xbe, 0x7d, 0x40, 0xba, 0x2f, 0x95, 0xb1, 0x2f,
0x87, 0x3b, 0x8a, 0xbe, 0x6a, 0xf4, 0xc2, 0x31,
0x74, 0xee, 0x91, 0xe0, 0x23, 0xaa, 0x5d, 0x7f,
0xdd, 0xf0, 0x44, 0x8c, 0x0b, 0x59, 0x2b, 0xfc,
0x48, 0x3a, 0xdf, 0x07, 0x05, 0x38, 0x6c, 0xc9,
0xeb, 0x18, 0x24, 0x68, 0x8d, 0x58, 0x98, 0xd3,
0x31, 0xa3, 0xe4, 0x70, 0x59, 0xb1, 0x21, 0xbe,
0x7e, 0x65, 0x7d, 0xb8, 0x04, 0xab, 0xf6, 0xe4,
0xd7, 0xda, 0xec, 0x09, 0x8f, 0xda, 0x6d, 0x24,
0x07, 0xcc, 0x29, 0x17, 0x05, 0x78, 0x1a, 0xc1,
0xb1, 0xce, 0xfc, 0xaa, 0x2d, 0xe7, 0xcc, 0x85,
0x84, 0x84, 0x03, 0x2a, 0x0c, 0x3f, 0xa9, 0xf8,
0xfd, 0x84, 0x53, 0x59, 0x5c, 0xf0, 0xd4, 0x09,
0xf0, 0xd2, 0x6c, 0x32, 0x03, 0xb0, 0xa0, 0x8c,
0x52, 0xeb, 0x23, 0x91, 0x88, 0x43, 0x13, 0x46,
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0xaa, 0x65, 0x60, 0xc3, 0x80, 0xca, 0xed, 0xa9,
0xf3, 0xb0, 0x79, 0x96, 0xa2, 0x55, 0x27, 0x28,
0x55, 0x73, 0x26, 0xa5, 0x50, 0xea, 0x92, 0x4b,
0x3c, 0x5c, 0x82, 0x33, 0xf0, 0x01, 0x3f, 0x03,
0xc1, 0x08, 0x05, 0xbf, 0x98, 0xf4, 0x9b, 0x6d,
0xa5, 0xa8, 0xb4, 0x82, 0x0c, 0x06, 0xfa, 0xff,
0x2d, 0x08, 0xf3, 0x05, 0x4f, 0x57, 0x2a, 0x39,
0xd4, 0x83, 0x0d, 0x75, 0x51, 0xd8, 0x5b, 0x1b,
0xd3, 0x51, 0x5a, 0x32, 0x2a, 0x9b, 0x32, 0xb2,
0xf2, 0xa4, 0x96, 0x12, 0xf2, 0xae, 0x40, 0x34,
0x67, 0xa8, 0xf5, 0x44, 0xd5, 0x35, 0x53, 0xfe,
0xa3, 0x60, 0x96, 0x63, 0x0f, 0x1f, 0x6e, 0xb0,
0x5a, 0x42, 0xa6, 0xfc, 0x51, 0x0b, 0x60, 0x27,
0xbc, 0x06, 0x71, 0xed, 0x65, 0x5b, 0x23, 0x86,
0x4a, 0x07, 0x3b, 0x22, 0x07, 0x46, 0xe6, 0x90,
0x3e, 0xf3, 0x25, 0x50, 0x1b, 0x4c, 0x7f, 0x03,
0x08, 0xa8, 0x36, 0x6b, 0x87, 0xe5, 0xe3, 0xdb,
0x9a, 0x38, 0x83, 0xff, 0x9f, 0x1a, 0x9f, 0x57,
0xa4, 0x2a, 0xf6, 0x37, 0xbc, 0x1a, 0xff, 0xc9,
0x1e, 0x35, 0x0c, 0xc3, 0x7c, 0xa3, 0xb2, 0xe5,
0xd2, 0xc6, 0xb4, 0x57, 0x47, 0xe4, 0x32, 0x16,
0x6d, 0xa9, 0xae, 0x64, 0xe6, 0x2d, 0x8d, 0xc5,
0x8d, 0x50, 0x8e, 0xe8, 0x1a, 0x22, 0x34, 0x2a,
0xd9, 0xeb, 0x51, 0x90, 0x4a, 0xb1, 0x41, 0x7d,
0x64, 0xf9, 0xb9, 0x0d, 0xf6, 0x23, 0x33, 0xb0,
0x33, 0xf4, 0xf7, 0x3f, 0x27, 0x84, 0xc6, 0x0f,
0x54, 0xa5, 0xc0, 0x2e, 0xec, 0x0b, 0x3a, 0x48,
0x6e, 0x80, 0x35, 0x81, 0x43, 0x9b, 0x90, 0xb1,
0xd0, 0x2b, 0xea, 0x21, 0xdc, 0xda, 0x5b, 0x09,
0xf4, 0xcc, 0x10, 0xb4, 0xc7, 0xfe, 0x79, 0x51,
0xc3, 0xc5, 0xac, 0x88, 0x74, 0x84, 0x0b, 0x4b,
0xca, 0x79, 0x16, 0x29, 0xfb, 0x69, 0x54, 0xdf,
0x41, 0x7e, 0xe9, 0xc7, 0x8e, 0xea, 0xa5, 0xfe,
0xfc, 0x76, 0x0e, 0x90, 0xc4, 0x92, 0x38, 0xad,
0x7b, 0x48, 0xe6, 0x6e, 0xf7, 0x21, 0xfd, 0x4e,
0x93, 0x0a, 0x7b, 0x41, 0x83, 0x68, 0xfb, 0x57,
0x51, 0x76, 0x34, 0xa9, 0x6c, 0x00, 0xaa, 0x4f,
0x66, 0x65, 0x98, 0x4a, 0x4f, 0xa3, 0xa0, 0xef,
0x69, 0x3f, 0xe3, 0x1c, 0x92, 0x8c, 0xfd, 0xd8,
0xe8, 0xde, 0x7c, 0x7f, 0x3e, 0x84, 0x8e, 0x69,
0x3c, 0xf1, 0xf2, 0x05, 0x46, 0xdc, 0x2f, 0x9d,
0x5e, 0x6e, 0x4c, 0xfb, 0xb5, 0x99, 0x2a, 0x59,
0x63, 0xc1, 0x34, 0xbc, 0x57, 0xc0, 0x0d, 0xb9,
0x61, 0x25, 0xf3, 0x33, 0x23, 0x51, 0xb6, 0x0d,
0x07, 0xa6, 0xab, 0x94, 0x4a, 0xb7, 0x2a, 0xea,
0xee, 0xac, 0xa3, 0xc3, 0x04, 0x8b, 0x0e, 0x56,
0xfe, 0x44, 0xa7, 0x39, 0xe2, 0xed, 0xed, 0xb4,
0x22, 0x2b, 0xac, 0x12, 0x32, 0x28, 0x91, 0xd8,
0xa5, 0xab, 0xff, 0x5f, 0xe0, 0x4b, 0xda, 0x78,
0x17, 0xda, 0xf1, 0x01, 0x5b, 0xcd, 0xe2, 0x5f,
0x50, 0x45, 0x73, 0x2b, 0xe4, 0x76, 0x77, 0xf4,
0x64, 0x1d, 0x43, 0xfb, 0x84, 0x7a, 0xea, 0x91,
0xae, 0xf9, 0x9e, 0xb7, 0xb4, 0xb0, 0x91, 0x5f,
0x16, 0x35, 0x9a, 0x11, 0xb8, 0xc7, 0xc1, 0x8c,
0xc6, 0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57,
0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4,
0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23,
0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17,
0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66,
0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39,
0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36,
0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00,
0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7,
0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60,
0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c,
0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
};
/* 100 test cases */
static struct crc_test {
u32 crc; /* random starting crc */
u32 start; /* random 6 bit offset in buf */
u32 length; /* random 11 bit length of test */
u32 crc_le; /* expected crc32_le result */
u32 crc_be; /* expected crc32_be result */
} test[] =
{ {
while (len--) { {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1},
unsigned char x = bitrev8(*buf); {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad},
*buf++ = x; {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f},
} {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a},
} {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2},
{0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793},
static void random_garbage(unsigned char *buf, size_t len) {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed},
{0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35},
{0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2},
{0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10},
{0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb},
{0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0},
{0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb},
{0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed},
{0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591},
{0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67},
{0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd},
{0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a},
{0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b},
{0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f},
{0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d},
{0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a},
{0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97},
{0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2},
{0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138},
{0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032},
{0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f},
{0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f},
{0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32},
{0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef},
{0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0},
{0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59},
{0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4},
{0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c},
{0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51},
{0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11},
{0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659},
{0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af},
{0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99},
{0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b},
{0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521},
{0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3},
{0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d},
{0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f},
{0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b},
{0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0},
{0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195},
{0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d},
{0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4},
{0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3},
{0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643},
{0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10},
{0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d},
{0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5},
{0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b},
{0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee},
{0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14},
{0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a},
{0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b},
{0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3},
{0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826},
{0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06},
{0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35},
{0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801},
{0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2},
{0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d},
{0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c},
{0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba},
{0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5},
{0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b},
{0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178},
{0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3},
{0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605},
{0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1},
{0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9},
{0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78},
{0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9},
{0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd},
{0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab},
{0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb},
{0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77},
{0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da},
{0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39},
{0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16},
{0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208},
{0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e},
{0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5},
{0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892},
{0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db},
{0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43},
{0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac},
{0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7},
{0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2},
{0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2},
{0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640},
{0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f},
{0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99},
{0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7},
{0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499},
{0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a},
};
#include <linux/time.h>
static int __init crc32_init(void)
{ {
while (len--) int i;
*buf++ = (unsigned char) random(); int errors = 0;
} int bytes = 0;
struct timespec start, stop;
u64 nsec;
unsigned long flags;
#if 0 /* Not used at present */ /* keep static to prevent cache warming code from
static void store_le(u32 x, unsigned char *buf) * getting eliminated by the compiler */
{ static u32 crc;
buf[0] = (unsigned char) x;
buf[1] = (unsigned char) (x >> 8);
buf[2] = (unsigned char) (x >> 16);
buf[3] = (unsigned char) (x >> 24);
}
#endif
static void store_be(u32 x, unsigned char *buf) /* pre-warm the cache */
{ for (i = 0; i < 100; i++) {
buf[0] = (unsigned char) (x >> 24); bytes += 2*test[i].length;
buf[1] = (unsigned char) (x >> 16);
buf[2] = (unsigned char) (x >> 8);
buf[3] = (unsigned char) x;
}
/* crc ^= crc32_le(test[i].crc, test_buf +
* This checks that CRC(buf + CRC(buf)) = 0, and that test[i].start, test[i].length);
* CRC commutes with bit-reversal. This has the side effect
* of bytewise bit-reversing the input buffer, and returns crc ^= crc32_be(test[i].crc, test_buf +
* the CRC of the reversed buffer. test[i].start, test[i].length);
*/
static u32 test_step(u32 init, unsigned char *buf, size_t len)
{
u32 crc1, crc2;
size_t i;
crc1 = crc32_be(init, buf, len);
store_be(crc1, buf + len);
crc2 = crc32_be(init, buf, len + 4);
if (crc2)
printf("\nCRC cancellation fail: 0x%08x should be 0\n",
crc2);
for (i = 0; i <= len + 4; i++) {
crc2 = crc32_be(init, buf, i);
crc2 = crc32_be(crc2, buf + i, len + 4 - i);
if (crc2)
printf("\nCRC split fail: 0x%08x\n", crc2);
} }
/* Now swap it around for the other test */ /* reduce OS noise */
local_irq_save(flags);
bytereverse(buf, len + 4); local_irq_disable();
init = bitrev32(init);
crc2 = bitrev32(crc1); getnstimeofday(&start);
if (crc1 != bitrev32(crc2)) for (i = 0; i < 100; i++) {
printf("\nBit reversal fail: 0x%08x -> 0x%08x -> 0x%08x\n", if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
crc1, crc2, bitrev32(crc2)); test[i].start, test[i].length))
crc1 = crc32_le(init, buf, len); errors++;
if (crc1 != crc2)
printf("\nCRC endianness fail: 0x%08x != 0x%08x\n", crc1, if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
crc2); test[i].start, test[i].length))
crc2 = crc32_le(init, buf, len + 4); errors++;
if (crc2)
printf("\nCRC cancellation fail: 0x%08x should be 0\n",
crc2);
for (i = 0; i <= len + 4; i++) {
crc2 = crc32_le(init, buf, i);
crc2 = crc32_le(crc2, buf + i, len + 4 - i);
if (crc2)
printf("\nCRC split fail: 0x%08x\n", crc2);
} }
getnstimeofday(&stop);
return crc1; local_irq_restore(flags);
} local_irq_enable();
#define SIZE 64 nsec = stop.tv_nsec - start.tv_nsec +
#define INIT1 0 1000000000 * (stop.tv_sec - start.tv_sec);
#define INIT2 0
int main(void) pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
{ CRC_LE_BITS, CRC_BE_BITS);
unsigned char buf1[SIZE + 4];
unsigned char buf2[SIZE + 4]; if (errors)
unsigned char buf3[SIZE + 4]; pr_warn("crc32: %d self tests failed\n", errors);
int i, j; else {
u32 crc1, crc2, crc3; pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
bytes, nsec);
for (i = 0; i <= SIZE; i++) {
printf("\rTesting length %d...", i);
fflush(stdout);
random_garbage(buf1, i);
random_garbage(buf2, i);
for (j = 0; j < i; j++)
buf3[j] = buf1[j] ^ buf2[j];
crc1 = test_step(INIT1, buf1, i);
crc2 = test_step(INIT2, buf2, i);
/* Now check that CRC(buf1 ^ buf2) = CRC(buf1) ^ CRC(buf2) */
crc3 = test_step(INIT1 ^ INIT2, buf3, i);
if (crc3 != (crc1 ^ crc2))
printf("CRC XOR fail: 0x%08x != 0x%08x ^ 0x%08x\n",
crc3, crc1, crc2);
} }
printf("\nAll test complete. No failures expected.\n");
return 0; return 0;
} }
#endif /* UNITTEST */ static void __exit crc32_exit(void)
{
}
module_init(crc32_init);
module_exit(crc32_exit);
#endif /* CONFIG_CRC32_SELFTEST */
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