linux-kernel - Re: [PATCH v2 1/3] lib: add crc64 calculation routines

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Message-ID: <4a25d281a0e7f622872f1e9fe3abf44288ec87e4.camel@linux.intel.com>
Date:   Tue, 17 Jul 2018 12:57:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Coly Li <colyli@...e.de>, linux-kernel@...r.kernel.org
Cc:     linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Lyle <mlyle@...e.org>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>
Subject: Re: [PATCH v2 1/3] lib: add crc64 calculation routines

On Tue, 2018-07-17 at 14:57 +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

> + * crc64.h
> + *

Do we need file name in the file?

> + * See lib/crc64.c for the related specification and polynomical
> arithmetic.
> + */

> +// SPDX-License-Identifier: GPL-2.0

> +#include <linux/module.h>
> +#include <uapi/linux/types.h>

Why not simple linux/types.h ?

> +#include "crc64table.h"
> +
> +MODULE_DESCRIPTION("CRC64 calculations");

> +MODULE_LICENSE("GPL");

License mismatch with SPDX.

> +#include <inttypes.h>
> +#include <linux/swab.h>
> +#include <stdio.h>

I would follow the common grouping of the headers, like more generic
first, more particular last:

inttupes
stdio

linux/foo

asm/bar

> +#include "../usr/include/asm/byteorder.h"

Hmm...


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy