linux-kernel - Re: (subset) [PATCH] leds: trigger: ledtrig-cpu:: Fix a warning when compiling with W=1

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Date:   Thu, 28 Sep 2023 14:09:31 +0100
From:   Lee Jones <lee@...nel.org>
To:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Bryan Wu <bryan.wu@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jamie Iles <jamie@...ieiles.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: (subset) [PATCH] leds: trigger: ledtrig-cpu:: Fix a warning
 when compiling with W=1

On Sat, 23 Sep 2023 09:15:38 +0200, Christophe JAILLET wrote:
> In order to teach the compiler that 'trig->name' will never be truncated,
> we need to tell it that 'cpu' is not negative.
> 
> When building with W=1, this fixes the following warnings:
> 
>   drivers/leds/trigger/ledtrig-cpu.c: In function ‘ledtrig_cpu_init’:
>   drivers/leds/trigger/ledtrig-cpu.c:155:56: error: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size 5 [-Werror=format-truncation=]
>     155 |                 snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
>         |                                                        ^~
>   drivers/leds/trigger/ledtrig-cpu.c:155:52: note: directive argument in the range [-2147483648, 7]
>     155 |                 snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
>         |                                                    ^~~~~~~
>   drivers/leds/trigger/ledtrig-cpu.c:155:17: note: ‘snprintf’ output between 5 and 15 bytes into a destination of size 8
>     155 |                 snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
>         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Applied, thanks!

[1/1] leds: trigger: ledtrig-cpu:: Fix a warning when compiling with W=1
      commit: 5272d74b29929c8395720a7e35971a4f0fb6783d

--
Lee Jones [李琼斯]