On Tue, 2018-07-17 at 22:55 +0800, Coly Li wrote: > This patch adds the re-write crc64 calculation routines for Linux > kernel. > The CRC64 polynomical arithmetic follows ECMA-182 specification, > inspired > by CRC paper of Dr. Ross N. Williams > (see http://www.ross.net/crc/download/crc_v3.txt) and other public > domain > implementations. > > All the changes work in this way, > - When Linux kernel is built, host program lib/gen_crc64table.c will > be > compiled to lib/gen_crc64table and executed. > - The output of gen_crc64table execution is an array called as lookup > table (a.k.a POLY 0x42f0e1eba9ea369) which contain 256 64bits-long > numbers, this talbe is dumped into header file lib/crc64table.h. > - Then the header file is included by lib/crc64.c for normal 64bit crc > calculation. > - Function declaration of the crc64 calculation routines is placed in > include/linux/crc64.h Thanks for an update! My comments below. > Co-developed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> As required by coding style this tag should be accompanied with SoB of co-developer(s). > +u64 __pure crc64_update(u64 crc, const void *_p, size_t len); For sake of consistency I would name _len as well. > + * Normal 64bit CRC calculation. I think 64-bit form is slightly better and more often $ git grep -n -w 64bit | wc -l 809 $ git grep -n -w 64-bit | wc -l 2957 > + * crc64table[256] is the lookup table of a table-driver 64bit CRC Ditto. > + * Copyright 2018 SUSE Linux. > + * Author: Coly Li <colyli@xxxxxxx> > + * This (blank comment) line is not needed. > +u64 __pure crc64_update(u64 crc, const void *_p, size_t len) _len ? > + * Copyright 2018 SUSE Linux. > + * Author: Coly Li <colyli@xxxxxxx> > + * Not needed line. > +#include <inttypes.h> > +#include <stdio.h> + blank line? Would separate groups of headers logically. > +#include <linux/swab.h> > +static int64_t crc64_table[256] = {0,}; I guess {0} would work as well (no comma). > + printf("#include <uapi/linux/types.h>\n"); > + printf("#include <linux/cache.h>\n\n"); Do wee need these? CRC32 case seems fine without. -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
