linux-kernel - Re: [PATCH v2 3/3] pinctrl: th1520: Convert dt child node loop to scoped iterator

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Message-ID: <ZwQiijdDKDHvwcOx@x1>
Date: Mon, 7 Oct 2024 11:03:54 -0700
From: Drew Fustini <dfustini@...storrent.com>
To: kernel test robot <lkp@...el.com>
Cc: Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>,
	Fu Wei <wefu@...hat.com>, Linus Walleij <linus.walleij@...aro.org>,
	oe-kbuild-all@...ts.linux.dev, linux-riscv@...ts.infradead.org,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] pinctrl: th1520: Convert dt child node loop to
 scoped iterator

On Mon, Oct 07, 2024 at 08:26:28PM +0800, kernel test robot wrote:
> Hi Drew,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on 2694868880705e8f6bb61b24b1b25adc42a4a217]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Drew-Fustini/pinctrl-th1520-Fix-return-value-for-unknown-pin-error/20241007-014953
> base:   2694868880705e8f6bb61b24b1b25adc42a4a217
> patch link:    https://lore.kernel.org/r/20241006-th1520-pinctrl-fixes-v2-3-b1822ae3a6d7%40tenstorrent.com
> patch subject: [PATCH v2 3/3] pinctrl: th1520: Convert dt child node loop to scoped iterator
> config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20241007/202410072033.XpRqZ8nz-lkp@intel.com/config)
> compiler: alpha-linux-gcc (GCC) 13.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241007/202410072033.XpRqZ8nz-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202410072033.XpRqZ8nz-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/pinctrl/pinctrl-th1520.c: In function 'th1520_pinctrl_dt_node_to_map':
> >> drivers/pinctrl/pinctrl-th1520.c:420:29: warning: unused variable 'child' [-Wunused-variable]
>      420 |         struct device_node *child;
>          |                             ^~~~~

It seems this is because the scoped iterator declares *child in the
macro and thus no separate declaration is needed:

 #define for_each_available_child_of_node_scoped(parent, child) \
         for (struct device_node *child __free(device_node) =            \
              of_get_next_available_child(parent, NULL);                 \
              child != NULL;                                             \
              child = of_get_next_available_child(parent, child))

I'll fix in next revision.

Thanks,
Drew