linux-kernel - include/drm/drm_print.h:524:49: warning: '%4.4s' directive argument is null

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Date:   Tue, 19 Sep 2023 23:50:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jeykumar Sankaran <quic_jeykumar@...cinc.com>
Subject: include/drm/drm_print.h:524:49: warning: '%4.4s' directive argument
 is null

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2cf0f715623872823a72e451243bbf555d10d032
commit: 48b3207e4ed9e5140c69e229b697373f233419c8 drm/msm/dpu: simplify CDP programming
date:   4 months ago
config: sparc-randconfig-r014-20230610 (https://download.01.org/0day-ci/archive/20230919/202309192301.fMQKWYsm-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309192301.fMQKWYsm-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/202309192301.fMQKWYsm-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/drm/drm_mm.h:51,
                    from include/drm/drm_vma_manager.h:26,
                    from include/drm/drm_gem.h:40,
                    from drivers/gpu/drm/msm/msm_drv.h:34,
                    from drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c:20:
   In function '_dpu_plane_set_qos_lut',
       inlined from 'dpu_plane_sspp_update_pipe' at drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c:1126:2:
>> include/drm/drm_print.h:524:49: warning: '%4.4s' directive argument is null [-Wformat-overflow=]
     524 | #define __drm_dbg(cat, fmt, ...)                ___drm_dbg(NULL, cat, fmt, ##__VA_ARGS__)
         |                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/drm/drm_print.h:582:9: note: in expansion of macro '__drm_dbg'
     582 |         __drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
         |         ^~~~~~~~~
   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c:29:39: note: in expansion of macro 'DRM_DEBUG_ATOMIC'
      29 | #define DPU_DEBUG_PLANE(pl, fmt, ...) DRM_DEBUG_ATOMIC("plane%d " fmt,\
         |                                       ^~~~~~~~~~~~~~~~
   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c:291:9: note: in expansion of macro 'DPU_DEBUG_PLANE'
     291 |         DPU_DEBUG_PLANE(pdpu, "pnum:%d fmt: %4.4s rt:%d fl:%u lut:0x%llx\n",
         |         ^~~~~~~~~~~~~~~


vim +524 include/drm/drm_print.h

3bf149bd3fe12a Jani Nikula 2019-10-28  522  
84ec67288c10fb Jim Cromie  2022-09-11  523  #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
d987150b539271 Wayne Lin   2022-12-23 @524  #define __drm_dbg(cat, fmt, ...)		___drm_dbg(NULL, cat, fmt, ##__VA_ARGS__)
84ec67288c10fb Jim Cromie  2022-09-11  525  #else
84ec67288c10fb Jim Cromie  2022-09-11  526  #define __drm_dbg(cat, fmt, ...)					\
16deeb8e18cafd Jim Cromie  2022-09-11  527  	_dynamic_func_call_cls(cat, fmt, ___drm_dbg,			\
84ec67288c10fb Jim Cromie  2022-09-11  528  			       cat, fmt, ##__VA_ARGS__)
84ec67288c10fb Jim Cromie  2022-09-11  529  #endif
e820f52577b14c Jim Cromie  2022-09-11  530  

:::::: The code at line 524 was first introduced by commit
:::::: d987150b539271b0394f24c1c648d2846662adb4 drm/drm_print: correct format problem

:::::: TO: Wayne Lin <Wayne.Lin@....com>
:::::: CC: Alex Deucher <alexander.deucher@....com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki