linux-kernel - Re: linux-next: build warning after merge of the kspp-gustavo tree

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Date:   Tue, 21 Nov 2023 17:19:40 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the kspp-gustavo tree


On 11/21/23 16:50, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the kspp-gustavo tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> In function 'aspeed_create_fan_tach_channel',
>      inlined from 'aspeed_create_fan' at drivers/hwmon/aspeed-pwm-tacho.c:877:2,
>      inlined from 'aspeed_pwm_tacho_probe' at drivers/hwmon/aspeed-pwm-tacho.c:936:9:
> drivers/hwmon/aspeed-pwm-tacho.c:751:49: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
>    751 |                 priv->fan_tach_ch_source[index] = pwm_source;
>        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
> drivers/hwmon/aspeed-pwm-tacho.c: In function 'aspeed_pwm_tacho_probe':
> drivers/hwmon/aspeed-pwm-tacho.c:193:12: note: at offset [48, 255] into destination object 'fan_tach_ch_source' of size 16
>    193 |         u8 fan_tach_ch_source[16];
>        |            ^~~~~~~~~~~~~~~~~~
> 
> Exposed by commit
> 
>    1b56c90018f0 ("Makefile: Enable -Wstringop-overflow globally")
> 
> This is with your tree on top of Linus' tree (and some fix patches but
> nothing that obviously touches anything relevent) and CONFIG_WERROR
> not set.
> 

Hi Stephen,

The fix for this issue is also in linux-next already:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=72cfe7a99c9ea1e64fc532f4f05c99991858dc34

Thanks!
--
Gustavo