linux-kernel - Re: [PATCH v2 18/19] spi: dw: Use regset32 DebugFS method to create regdump file

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Date:   Mon, 18 May 2020 18:06:56 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Georgy Vlasov <Georgy.Vlasov@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Allison Randal <allison@...utok.net>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org,
        Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@...el.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Clement Leger <cleger@...ray.eu>,
        "wuxu.wu" <wuxu.wu@...wei.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 18/19] spi: dw: Use regset32 DebugFS method to create
 regdump file

On Mon, May 18, 2020 at 05:08:25PM +0300, Serge Semin wrote:
> On Mon, May 18, 2020 at 02:18:22PM +0300, Andy Shevchenko wrote:
> > On Sat, May 16, 2020 at 11:46:34PM +0300, Serge Semin wrote:
> > > On Fri, May 15, 2020 at 06:10:56PM +0300, Andy Shevchenko wrote:
> > > > On Fri, May 15, 2020 at 01:47:57PM +0300, Serge Semin wrote:
> > > > > DebugFS kernel interface provides a dedicated method to create the
> > > > > registers dump file. Use it instead of creating a generic DebugFS
> > > > > file with manually written read callback function.

> > > > With below nit addressed,
> > > > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > 
> > > > > +#define DW_SPI_DBGFS_REG(_name, _off)	\
> > > > > +{					\
> > > > > +	.name = _name,			\
> > > > 
> > > > > +	.offset = _off			\
> > > > 
> > > > As previously discussed (did I miss your answer?) the comma at the end leaves
> > > > better pattern for maintenance prospective.
> > > 
> > > Ah, sorry. Missed that. This comma is hardly needed seeing the structure
> > > consists of just two elements. So I'd rather leave it as is.
> > 
> > While it's a really small thing, I consider that it's not good to make
> > someone's else problem what can be done here. So, please, consider to add a
> > comma. Look at the other drivers and code in the kernel. This is at least
> > defacto preferred style.
> 
> Andy, you never give up, don't you? =)

First of all, I really appreciate work you have done so far (I mean it).
Now to the point.

You see, I always try to have a rationale behind any proposed comment. I agree,
that some of them can be considered as a bikeshedding for a certain developer,
but on big picture with this scale of project even small change (being made or
being rejected to be made) can provoke additional churn with a good magnitude,
if we consider all possible cases where somebody, e.g., can take into account
existing code to copy'n'paste from). So, I would easy give up on something if
there will be a stronger (than mine) argument why the proposed thing is not
good to be done (at least as a part of the discussed patch set). I also want
to and will learn from the developers as a reviewer.

Hope that above will clarify my reviewer's point of view to the code.

> Agreed then. I'll add comma to the
> initializer and also after the last member here:
>         DW_SPI_DBGFS_REG("ISR", DW_SPI_ISR),
>         DW_SPI_DBGFS_REG("DMACR", DW_SPI_DMACR),
>         DW_SPI_DBGFS_REG("DMATDLR", DW_SPI_DMATDLR),
> -       DW_SPI_DBGFS_REG("DMARDLR", DW_SPI_DMARDLR)
> +       DW_SPI_DBGFS_REG("DMARDLR", DW_SPI_DMARDLR),

Good catch, thanks for taking it into consideration as well.

>  };
>  
>  static int dw_spi_debugfs_init(struct dw_spi *dws)

-- 
With Best Regards,
Andy Shevchenko