linux-kernel - Re: [PATCH v4 04/23] mtd: nand: denali: avoid hard-coding ECC step, strength, bytes

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Date:   Wed, 7 Jun 2017 09:02:50 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org, Enrico Jorns <ejo@...gutronix.de>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Graham Moore <grmoore@...nsource.altera.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 04/23] mtd: nand: denali: avoid hard-coding ECC step,
 strength, bytes

On Wed, 7 Jun 2017 12:09:31 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> >> +
> >> +static int denali_ecc_setup(struct mtd_info *mtd, struct nand_chip *chip,
> >> +                         struct denali_nand_info *denali)
> >> +{
> >> +     struct nand_ecc_caps caps;
> >> +     int ret;
> >> +
> >> +     caps.stepinfos = denali->stepinfo;
> >> +     caps.nstepinfos = 1;
> >> +     caps.calc_ecc_bytes = denali_calc_ecc_bytes;
> >> +     caps.oob_reserve_bytes = denali->bbtskipbytes;  
> >
> > If you get rid of this oob_reserve_bytes field, you can define caps as
> > a static const and even directly store ecc_caps in denali_nand_info.  
> 
> To make caps static const, denali_calc_ecc_bytes must be exported
> to be referenced from denali_dt/denali_pci.
> I am reluctant to do it.

You already duplicate other information in denali_dt.c and
denali_pci.c, so what prevents you from duplicating this one-line
function?

Also, denali core already exports 2 functions, I don't see the problem
in exporting the common nand_ecc_caps object. Why are you reluctant to
that?