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: Bob Pearson <rpearson@systemfabricworks.com>
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 691 insertions, 117 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 028aba9e72af..d5a86aa441ac 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -70,6 +70,16 @@ config CRC32
           kernel tree does. Such modules that use library CRC32 functions
           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
         tristate "CRC7 functions"
         help
diff --git a/lib/crc32.c b/lib/crc32.c
index c3ce94a06db8..996115d4f377 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -211,137 +211,701 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
 EXPORT_SYMBOL(crc32_le);
 EXPORT_SYMBOL(crc32_be);
 
-#ifdef UNITTEST
+#ifdef CONFIG_CRC32_SELFTEST
 
-#include <stdlib.h>
-#include <stdio.h>
-
-#if 0                           /*Not used at present */
-static void
-buf_dump(char const *prefix, unsigned char const *buf, size_t len)
+/* 4096 random bytes */
+static u8 __attribute__((__aligned__(8))) test_buf[] =
 {
-        fputs(prefix, stdout);
-        while (len--)
-                printf(" %02x", *buf++);
-        putchar('\n');
-
-}
-#endif
-
-static void bytereverse(unsigned char *buf, size_t len)
+        0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
+        0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
+        0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
+        0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
+        0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
+        0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
+        0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
+        0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
+        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,
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+        0xdc, 0x94, 0x28, 0x67, 0x4e, 0xb7, 0x25, 0x48,
+        0x8a, 0xc2, 0xe0, 0x60, 0x96, 0xcc, 0x18, 0xf4,
+        0x84, 0xdd, 0xa7, 0x5e, 0x3e, 0x05, 0x0b, 0x26,
+        0x26, 0xb2, 0x5c, 0x1f, 0x57, 0x1a, 0x04, 0x7e,
+        0x6a, 0xe3, 0x2f, 0xb4, 0x35, 0xb6, 0x38, 0x40,
+        0x40, 0xcd, 0x6f, 0x87, 0x2e, 0xef, 0xa3, 0xd7,
+        0xa9, 0xc2, 0xe8, 0x0d, 0x27, 0xdf, 0x44, 0x62,
+        0x99, 0xa0, 0xfc, 0xcf, 0x81, 0x78, 0xcb, 0xfe,
+        0xe5, 0xa0, 0x03, 0x4e, 0x6c, 0xd7, 0xf4, 0xaf,
+        0x7a, 0xbb, 0x61, 0x82, 0xfe, 0x71, 0x89, 0xb2,
+        0x22, 0x7c, 0x8e, 0x83, 0x04, 0xce, 0xf6, 0x5d,
+        0x84, 0x8f, 0x95, 0x6a, 0x7f, 0xad, 0xfd, 0x32,
+        0x9c, 0x5e, 0xe4, 0x9c, 0x89, 0x60, 0x54, 0xaa,
+        0x96, 0x72, 0xd2, 0xd7, 0x36, 0x85, 0xa9, 0x45,
+        0xd2, 0x2a, 0xa1, 0x81, 0x49, 0x6f, 0x7e, 0x04,
+        0xfa, 0xe2, 0xfe, 0x90, 0x26, 0x77, 0x5a, 0x33,
+        0xb8, 0x04, 0x9a, 0x7a, 0xe6, 0x4c, 0x4f, 0xad,
+        0x72, 0x96, 0x08, 0x28, 0x58, 0x13, 0xf8, 0xc4,
+        0x1c, 0xf0, 0xc3, 0x45, 0x95, 0x49, 0x20, 0x8c,
+        0x9f, 0x39, 0x70, 0xe1, 0x77, 0xfe, 0xd5, 0x4b,
+        0xaf, 0x86, 0xda, 0xef, 0x22, 0x06, 0x83, 0x36,
+        0x29, 0x12, 0x11, 0x40, 0xbc, 0x3b, 0x86, 0xaa,
+        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--) {
-                unsigned char x = bitrev8(*buf);
-                *buf++ = x;
-        }
-}
-
-static void random_garbage(unsigned char *buf, size_t len)
+        {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1},
+        {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad},
+        {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f},
+        {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a},
+        {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2},
+        {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793},
+        {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--)
-                *buf++ = (unsigned char) random();
-}
+        int i;
+        int errors = 0;
+        int bytes = 0;
+        struct timespec start, stop;
+        u64 nsec;
+        unsigned long flags;
 
-#if 0                           /* Not used at present */
-static void store_le(u32 x, unsigned char *buf)
-{
-        buf[0] = (unsigned char) x;
-        buf[1] = (unsigned char) (x >> 8);
-        buf[2] = (unsigned char) (x >> 16);
-        buf[3] = (unsigned char) (x >> 24);
-}
-#endif
+        /* keep static to prevent cache warming code from
+         * getting eliminated by the compiler */
+        static u32 crc;
 
-static void store_be(u32 x, unsigned char *buf)
-{
-        buf[0] = (unsigned char) (x >> 24);
-        buf[1] = (unsigned char) (x >> 16);
-        buf[2] = (unsigned char) (x >> 8);
-        buf[3] = (unsigned char) x;
-}
+        /* pre-warm the cache */
+        for (i = 0; i < 100; i++) {
+                bytes += 2*test[i].length;
 
-/*
- * This checks that CRC(buf + CRC(buf)) = 0, and that
- * CRC commutes with bit-reversal.  This has the side effect
- * of bytewise bit-reversing the input buffer, and returns
- * the CRC of the reversed buffer.
- */
-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);
+                crc ^= crc32_le(test[i].crc, test_buf +
+                    test[i].start, test[i].length);
+
+                crc ^= crc32_be(test[i].crc, test_buf +
+                    test[i].start, test[i].length);
         }
 
-        /* Now swap it around for the other test */
-
-        bytereverse(buf, len + 4);
-        init = bitrev32(init);
-        crc2 = bitrev32(crc1);
-        if (crc1 != bitrev32(crc2))
-                printf("\nBit reversal fail: 0x%08x -> 0x%08x -> 0x%08x\n",
-                       crc1, crc2, bitrev32(crc2));
-        crc1 = crc32_le(init, buf, len);
-        if (crc1 != crc2)
-                printf("\nCRC endianness fail: 0x%08x != 0x%08x\n", crc1,
-                       crc2);
-        crc2 = crc32_le(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_le(init, buf, i);
-                crc2 = crc32_le(crc2, buf + i, len + 4 - i);
-                if (crc2)
-                        printf("\nCRC split fail: 0x%08x\n", crc2);
+        /* reduce OS noise */
+        local_irq_save(flags);
+        local_irq_disable();
+
+        getnstimeofday(&start);
+        for (i = 0; i < 100; i++) {
+                if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
+                    test[i].start, test[i].length))
+                        errors++;
+
+                if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
+                    test[i].start, test[i].length))
+                        errors++;
         }
+        getnstimeofday(&stop);
 
-        return crc1;
-}
+        local_irq_restore(flags);
+        local_irq_enable();
 
-#define SIZE 64
-#define INIT1 0
-#define INIT2 0
+        nsec = stop.tv_nsec - start.tv_nsec +
+                1000000000 * (stop.tv_sec - start.tv_sec);
 
-int main(void)
-{
-        unsigned char buf1[SIZE + 4];
-        unsigned char buf2[SIZE + 4];
-        unsigned char buf3[SIZE + 4];
-        int i, j;
-        u32 crc1, crc2, crc3;
-
-        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);
+        pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
+                 CRC_LE_BITS, CRC_BE_BITS);
+
+        if (errors)
+                pr_warn("crc32: %d self tests failed\n", errors);
+        else {
+                pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
+                        bytes, nsec);
         }
-        printf("\nAll test complete.  No failures expected.\n");
+
         return 0;
 }
 
-#endif                          /* UNITTEST */
+static void __exit crc32_exit(void)
+{
+}
+
+module_init(crc32_init);
+module_exit(crc32_exit);
+#endif /* CONFIG_CRC32_SELFTEST */