forked from mirrors/linux
d8372ba8ce
gen_crc64table requires linux include files to be installed in
/usr/include/linux. This is a new requrement so hosts that could
previously build the kernel, now cannot.
gen_crc64table makes this requirement by including <linux/swab.h>, but
nothing from that header is actaully used.
So remove the #include, so that the linux headers no longer need to be
installed.
Fixes: feba04fd2c ("lib: add crc64 calculation routines")
Signed-off-by: NeilBrown <neil@brown.name>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Generate lookup table for the table-driven CRC64 calculation.
|
|
*
|
|
* gen_crc64table is executed in kernel build time and generates
|
|
* lib/crc64table.h. This header is included by lib/crc64.c for
|
|
* the table-driven CRC64 calculation.
|
|
*
|
|
* See lib/crc64.c for more information about which specification
|
|
* and polynomial arithmetic that gen_crc64table.c follows to
|
|
* generate the lookup table.
|
|
*
|
|
* Copyright 2018 SUSE Linux.
|
|
* Author: Coly Li <colyli@suse.de>
|
|
*/
|
|
#include <inttypes.h>
|
|
#include <stdio.h>
|
|
|
|
#define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
|
|
|
|
static uint64_t crc64_table[256] = {0};
|
|
|
|
static void generate_crc64_table(void)
|
|
{
|
|
uint64_t i, j, c, crc;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
crc = 0;
|
|
c = i << 56;
|
|
|
|
for (j = 0; j < 8; j++) {
|
|
if ((crc ^ c) & 0x8000000000000000ULL)
|
|
crc = (crc << 1) ^ CRC64_ECMA182_POLY;
|
|
else
|
|
crc <<= 1;
|
|
c <<= 1;
|
|
}
|
|
|
|
crc64_table[i] = crc;
|
|
}
|
|
}
|
|
|
|
static void print_crc64_table(void)
|
|
{
|
|
int i;
|
|
|
|
printf("/* this file is generated - do not edit */\n\n");
|
|
printf("#include <linux/types.h>\n");
|
|
printf("#include <linux/cache.h>\n\n");
|
|
printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
|
|
for (i = 0; i < 256; i++) {
|
|
printf("\t0x%016" PRIx64 "ULL", crc64_table[i]);
|
|
if (i & 0x1)
|
|
printf(",\n");
|
|
else
|
|
printf(", ");
|
|
}
|
|
printf("};\n");
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
generate_crc64_table();
|
|
print_crc64_table();
|
|
return 0;
|
|
}
|