linux-kernel - Re: [PATCH v1 3/7] net/fsl: add ACPI support for mdio bus

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Message-ID: <CAHp75VehAzdXrQRL5t3-5Nm0rrdkRdX20rEUhyHNFy_D0Vvtqg@mail.gmail.com>
Date:   Tue, 4 Feb 2020 13:17:36 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Calvin Johnson (OSS)" <calvin.johnson@....nxp.com>
Cc:     "linux.cj@...il.com" <linux.cj@...il.com>,
        Jon Nettleton <jon@...id-run.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Makarand Pawagi <makarand.pawagi@....com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Varun Sethi <V.Sethi@....com>,
        Pankaj Bansal <pankaj.bansal@....com>,
        "Rajesh V. Bikkina" <rajesh.bikkina@....com>,
        "David S. Miller" <davem@...emloft.net>,
        "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v1 3/7] net/fsl: add ACPI support for mdio bus

On Tue, Feb 4, 2020 at 9:18 AM Calvin Johnson (OSS)
<calvin.johnson@....nxp.com> wrote:
> > -----Original Message-----
> > From: Andy Shevchenko <andy.shevchenko@...il.com>
> > Subject: Re: [PATCH v1 3/7] net/fsl: add ACPI support for mdio bus
> > On Fri, Jan 31, 2020 at 5:37 PM Calvin Johnson <calvin.johnson@....com>
> > wrote:

...

> > > -       snprintf(bus->id, MII_BUS_ID_SIZE, "%llx", (unsigned long
> > long)res.start);
> > > +       snprintf(bus->id, MII_BUS_ID_SIZE, "%llx",
> > > +                (unsigned long long)res->start);
> >
> > Why this has been touched?
>
> Without this change, I get:
> ---------------------------------------------------------
> drivers/net/ethernet/freescale/xgmac_mdio.c: In function 'xgmac_mdio_probe':
> drivers/net/ethernet/freescale/xgmac_mdio.c:269:27: error: request for member 'start' in something not a structure or union
>     (unsigned long long)res.start);
>                            ^
> scripts/Makefile.build:265: recipe for target 'drivers/net/ethernet/freescale/xgmac_mdio.o' failed
> make[4]: *** [drivers/net/ethernet/freescale/xgmac_mdio.o] Error 1
> ---------------------------------------------------------

I see. Thanks.
Can you leave it one line as it was before?

...

> > (Hint: missed terminator)
> static const struct acpi_device_id xgmac_mdio_acpi_match[] = {
>         { "NXP0006", 0 },
>         { }
> };
> Is this what you meant?

Yes!

...

> > > +               .acpi_match_table = ACPI_PTR(xgmac_mdio_acpi_match),
> >
> > ACPI_PTR is not needed otherwise you will get a compiler warning.
>
> No compiler warning was observed in both cases.

You mean you tried CONFIG_ACPI=n and didn't get a warning about unused
static variable?
Perhaps you may run `make W=1 ...`

> I can see other drivers using this macro.

They might have hidden same issue.

-- 
With Best Regards,
Andy Shevchenko