drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c:147:5: warning: no previous prototype for 'tinydrm_display_pipe_init'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1612c382ffbdf1f673caec76502b1c00e6d35363
commit: 96f2a9aef5987340d367ab7497ae972a55e6f71c drm/tinydrm: tinydrm_display_pipe_init() don't use tinydrm_device
date:   3 years, 6 months ago
config: parisc-randconfig-r022-20220805 (https://download.01.org/0day-ci/archive/20220807/202208071706.bgRl6mce-lkp@xxxxxxxxx/config)
compiler: hppa64-linux-gcc (GCC) 12.1.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96f2a9aef5987340d367ab7497ae972a55e6f71c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 96f2a9aef5987340d367ab7497ae972a55e6f71c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

   hppa64-linux-ld: drivers/tty/serial/8250/8250_gsc.o: in function `.LC4':
>> (.data.rel.ro+0x8): undefined reference to `iosapic_serial_irq'
--
   In file included from arch/parisc/include/asm/io.h:6,
                    from include/linux/fb.h:17,
                    from include/drm/drm_crtc.h:31,
                    from include/drm/drm_atomic_helper.h:31,
                    from drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c:10:
   include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full':
   arch/parisc/include/asm/pgtable.h:60:23: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
      60 |                 pte_t old_pte;                                  \
         |                       ^~~~~~~
   arch/parisc/include/asm/pgtable.h:289:34: note: in expansion of macro 'set_pte_at'
     289 | #define pte_clear(mm, addr, xp)  set_pte_at(mm, addr, xp, __pte(0))
         |                                  ^~~~~~~~~~
   include/asm-generic/pgtable.h:201:9: note: in expansion of macro 'pte_clear'
     201 |         pte_clear(mm, address, ptep);
         |         ^~~~~~~~~
   include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit':
   arch/parisc/include/asm/pgtable.h:60:23: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
      60 |                 pte_t old_pte;                                  \
         |                       ^~~~~~~
   include/asm-generic/pgtable.h:629:9: note: in expansion of macro 'set_pte_at'
     629 |         set_pte_at(mm, addr, ptep, pte);
         |         ^~~~~~~~~~
   drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c: At top level:
   drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c:85:1: warning: no previous prototype for 'tinydrm_connector_create' [-Wmissing-prototypes]
      85 | tinydrm_connector_create(struct drm_device *drm,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c:147:5: warning: no previous prototype for 'tinydrm_display_pipe_init' [-Wmissing-prototypes]
     147 | int tinydrm_display_pipe_init(struct drm_device *drm,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/tinydrm_display_pipe_init +147 drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c

    83	
    84	struct drm_connector *
  > 85	tinydrm_connector_create(struct drm_device *drm,
    86				 const struct drm_display_mode *mode,
    87				 int connector_type)
    88	{
    89		struct tinydrm_connector *tconn;
    90		struct drm_connector *connector;
    91		int ret;
    92	
    93		tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);
    94		if (!tconn)
    95			return ERR_PTR(-ENOMEM);
    96	
    97		drm_mode_copy(&tconn->mode, mode);
    98		connector = &tconn->base;
    99	
   100		drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);
   101		ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,
   102					 connector_type);
   103		if (ret) {
   104			kfree(tconn);
   105			return ERR_PTR(ret);
   106		}
   107	
   108		connector->status = connector_status_connected;
   109	
   110		return connector;
   111	}
   112	
   113	static int tinydrm_rotate_mode(struct drm_display_mode *mode,
   114				       unsigned int rotation)
   115	{
   116		if (rotation == 0 || rotation == 180) {
   117			return 0;
   118		} else if (rotation == 90 || rotation == 270) {
   119			swap(mode->hdisplay, mode->vdisplay);
   120			swap(mode->hsync_start, mode->vsync_start);
   121			swap(mode->hsync_end, mode->vsync_end);
   122			swap(mode->htotal, mode->vtotal);
   123			swap(mode->width_mm, mode->height_mm);
   124			return 0;
   125		} else {
   126			return -EINVAL;
   127		}
   128	}
   129	
   130	/**
   131	 * tinydrm_display_pipe_init - Initialize display pipe
   132	 * @drm: DRM device
   133	 * @pipe: Display pipe
   134	 * @funcs: Display pipe functions
   135	 * @connector_type: Connector type
   136	 * @formats: Array of supported formats (DRM_FORMAT\_\*)
   137	 * @format_count: Number of elements in @formats
   138	 * @mode: Supported mode
   139	 * @rotation: Initial @mode rotation in degrees Counter Clock Wise
   140	 *
   141	 * This function sets up a &drm_simple_display_pipe with a &drm_connector that
   142	 * has one fixed &drm_display_mode which is rotated according to @rotation.
   143	 *
   144	 * Returns:
   145	 * Zero on success, negative error code on failure.
   146	 */
 > 147	int tinydrm_display_pipe_init(struct drm_device *drm,

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp