linux-kernel - Re: drivers/pinctrl/bcm/pinctrl-ns.c:286:53: warning: passing argument 3 of 'pinmux_generic_add_function' discards 'const' qualifier from pointer target type

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Date:   Wed, 22 Dec 2021 10:09:09 +0100
From:   Rafał Miłecki <rafal@...ecki.pl>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: drivers/pinctrl/bcm/pinctrl-ns.c:286:53: warning: passing
 argument 3 of 'pinmux_generic_add_function' discards 'const' qualifier from
 pointer target type

On 22.12.2021 09:55, kernel test robot wrote:
> tree:   https://github.com/0day-ci/linux/commits/UPDATE-20211222-144502/Rafa-Mi-ecki/pinctrl-bcm-ns-use-generic-groups-functions-helpers/20211117-064419
> head:   da7c70cdea1466b4234a30658ee2b5383545a629
> commit: da7c70cdea1466b4234a30658ee2b5383545a629 pinctrl: bcm: ns: use generic groups & functions helpers
> date:   2 hours ago
> config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20211222/202112221651.gLNfcGwH-lkp@intel.com/config)
> compiler: arceb-elf-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # https://github.com/0day-ci/linux/commit/da7c70cdea1466b4234a30658ee2b5383545a629
>          git remote add linux-review https://github.com/0day-ci/linux
>          git fetch --no-tags linux-review UPDATE-20211222-144502/Rafa-Mi-ecki/pinctrl-bcm-ns-use-generic-groups-functions-helpers/20211117-064419
>          git checkout da7c70cdea1466b4234a30658ee2b5383545a629
>          # save the config file to linux build tree
>          mkdir build_dir
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash drivers/pinctrl/bcm/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>     drivers/pinctrl/bcm/pinctrl-ns.c: In function 'ns_pinctrl_probe':
>>> drivers/pinctrl/bcm/pinctrl-ns.c:286:53: warning: passing argument 3 of 'pinmux_generic_add_function' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       286 |                                             function->groups,
>           |                                             ~~~~~~~~^~~~~~~~
>     In file included from drivers/pinctrl/bcm/pinctrl-ns.c:18:
>     drivers/pinctrl/bcm/../pinmux.h:153:46: note: expected 'const char **' but argument is of type 'const char * const*'
>       153 |                                 const char **groups,
>           |                                 ~~~~~~~~~~~~~^~~~~~

This patch targets following git tree:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/log/?h=for-next

As stated in the commit message it depends on the:
bd0aae66c482 ("pinctrl: add one more "const" for function groups")