[PATCH v2 4/5] driver core: Add device probe log helper dev_warn_probe()

[kernel test robot]

Hi Dragan,

kernel test robot noticed the following build errors:

[auto build test ERROR on rockchip/for-next]
[also build test ERROR on broonie-spi/for-next driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.11 next-20240927]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dragan-Simic/spi-rockchip-Perform-trivial-code-cleanups/20240928-121548
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
patch link:    https://lore.kernel.org/r/2fd9a60e0efe906dc7a203cd652c8d0b7f932470.1727496560.git.dsimic%40manjaro.org
patch subject: [PATCH v2 4/5] driver core: Add device probe log helper dev_warn_probe()
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20240929/202409290910.55WdSCMH-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240929/202409290910.55WdSCMH-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409290910.55WdSCMH-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/base/core.c: In function 'dev_probe_failed':
>> drivers/base/core.c:4988:16: error: assignment to '__va_list_tag (*)[1]' from incompatible pointer type '__va_list_tag **' [-Wincompatible-pointer-types]
    4988 |         vaf.va = &args;
         |                ^
   drivers/base/core.c: In function 'dev_err_probe':
   drivers/base/core.c:5055:1: warning: control reaches end of non-void function [-Wreturn-type]
    5055 | }
         | ^
   drivers/base/core.c: In function 'dev_warn_probe':
   drivers/base/core.c:5101:1: warning: control reaches end of non-void function [-Wreturn-type]
    5101 | }
         | ^


vim +4988 drivers/base/core.c

  4981	
  4982	static int dev_probe_failed(const struct device *dev, int err, bool fatal,
  4983				    const char *fmt, va_list args)
  4984	{
  4985		struct va_format vaf;
  4986	
  4987		vaf.fmt = fmt;
> 4988		vaf.va = &args;
  4989	
  4990		switch (err) {
  4991		case -EPROBE_DEFER:
  4992			device_set_deferred_probe_reason(dev, &vaf);
  4993			dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
  4994			break;
  4995	
  4996		case -ENOMEM:
  4997			/* Don't print anything on -ENOMEM, there's already enough output */
  4998			break;
  4999	
  5000		default:
  5001			/* Log fatal final failures as errors, otherwise produce warnings */
  5002			if (fatal)
  5003				dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
  5004			else
  5005				dev_warn(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
  5006			break;
  5007		}
  5008	
  5009		return err;
  5010	}
  5011	

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