linux-kernel - Re: [PATCH 0/6] lib/crc32: treewide: Use existing define with polynomial

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Date:   Tue, 17 Jul 2018 17:12:58 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        Fugang Duan <fugang.duan@....com>,
        Pantelis Antoniou <pantelis.antoniou@...il.com>,
        Vitaly Bordug <vbordug@...mvista.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 0/6] lib/crc32: treewide: Use existing define with
 polynomial

Hi Krzysztof,

On Tue, Jul 17, 2018 at 06:05:35PM +0200, Krzysztof Kozlowski wrote:
> Hi,
> 
> Kernel defines same polynomial for CRC-32 in few places.
> This is unnecessary duplication of the same value. Also this might
> be error-prone for future code - every driver will define the
> polynomial again.
> 
> This is an attempt to unify definition of polynomial.  Few obvious
> hard-coded locations are fixed with define.
> 
> All series depend on each 1/6 and 2/6.
> 
> This could be merged in two different merge windows (1st lib/crc and then
> the rest) or taken through one tree.
> 
> It would be nice to get some testing. Only generic lib/crc, bunzip, xz_crc32
> and Freescale's Ethernet driver were tested on HW.  Rest got just different
> builds.
> 
> Best regards,
> Krzysztof
> 
> Krzysztof Kozlowski (6):
>   lib/crc: Move polynomial definition to separate header
>   lib/crc: Use consistent naming for CRC-32 polynomials
>   crypto: stm32_crc32 - Use existing define with polynomial
>   net: ethernet: Use existing define with polynomial
>   staging: rtl: Use existing define with polynomial
>   lib: Use existing define with polynomial
> 
>  drivers/crypto/stm32/stm32_crc32.c               | 11 ++++-------
>  drivers/net/ethernet/amd/xgbe/xgbe-dev.c         |  4 ++--
>  drivers/net/ethernet/apple/bmac.c                |  8 ++------
>  drivers/net/ethernet/broadcom/tg3.c              |  3 ++-
>  drivers/net/ethernet/freescale/fec_main.c        |  4 ++--
>  drivers/net/ethernet/freescale/fs_enet/fec.h     |  3 ---
>  drivers/net/ethernet/freescale/fs_enet/mac-fec.c |  3 ++-
>  drivers/net/ethernet/micrel/ks8851_mll.c         |  3 ++-
>  drivers/net/ethernet/synopsys/dwc-xlgmac-hw.c    |  4 ++--
>  drivers/staging/rtl8712/rtl871x_security.c       |  5 ++---
>  drivers/staging/rtl8723bs/core/rtw_security.c    |  5 ++---
>  include/linux/crc32poly.h                        | 20 ++++++++++++++++++++
>  lib/crc32.c                                      | 11 ++++++-----
>  lib/crc32defs.h                                  | 14 --------------
>  lib/decompress_bunzip2.c                         |  3 ++-
>  lib/gen_crc32table.c                             |  5 +++--
>  lib/xz/xz_crc32.c                                |  3 ++-
>  17 files changed, 55 insertions(+), 54 deletions(-)
>  create mode 100644 include/linux/crc32poly.h
> 

Did you check whether any of these users can be converted to use the CRC
implementations in lib/, so they wouldn't need the polynomial definition
themselves?

- Eric