linux-kernel - Re: [PATCH] tc: fix warning and coding style

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Date:	Tue, 30 Sep 2014 16:08:39 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Thibaut Robert <thibaut.robert@...il.com>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tc: fix warning and coding style

Hi Thibaut,

On Tue, Sep 30, 2014 at 3:51 PM, Thibaut Robert
<thibaut.robert@...il.com> wrote:
> Le mardi 30 septembre 2014 à 14:28 +0200, Geert Uytterhoeven a écrit :
>> On Tue, Sep 30, 2014 at 2:16 PM, Thibaut Robert
>> <thibaut.robert@...il.com> wrote:
>> > Fix gcc warning:
>> > warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘resource_size_t’ [-Wformat=]
>> >
>> > As resource_size_t can be 32 or 64 bits (depending on CONFIG_RESOURCES_64BIT), this patch uses "%lld" format along with a cast to u64 for printing resource_size_t values
>>
>> Please use %pR instead (cfr. Documentation/printk-formats.txt).
>
> This code use 'resource_size_t' but I think %pR is for 'struct resource'. I got inspired by this patch: https://lkml.org/lkml/2008/8/29/187

Oops, sorry for (mis)behaving like a bad script.

> However, I've thought again, and '%u' is probably enough for displaying a size in MiB. So I propose the following :
> (Parens around the cast were also missing in my first patch):
>
> @@ -117,10 +114,10 @@ static void __init tc_bus_add_devices(struct tc_bus *tbus)
>                         tdev->resource.start = extslotaddr;
>                         tdev->resource.end = extslotaddr + devsize - 1;
>                 } else {
> -                       printk(KERN_ERR "%s: Cannot provide slot space "
> -                              "(%dMiB required, up to %dMiB supported)\n",
> -                              dev_name(&tdev->dev), devsize >> 20,
> -                              max(slotsize, extslotsize) >> 20);
> +                       dev_err(&tdev->dev,
> +                               "Cannot provide slot space (%uMiB required, up to %uMiB supported)\n",
> +                               (unsigned int) (devsize >> 20),
> +                               (unsigned int) (max(slotsize, extslotsize) >> 20));
>                         kfree(tdev);
>                         goto out_err;
>                 }
>
>
> WDYT ?

I guess that's acceptable, as tc is probably limited to 32-bit anyway. Maciej?

Note that there's also %pa, for phys_addr_t/resource_size_t.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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