[arnd-playground:warnings-5.10-2 49/55] drivers/gpu/drm/kmb/kmb_plane.c:128:20: warning: array subscript 3 is above array bounds of 'struct

[arnd-playground:warnings-5.10-2 49/55] drivers/gpu/drm/kmb/kmb_plane.c:128:20: warning: array subscript 3 is above array bounds of 'struct

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git warnings-5.10-2
head:   6bf755201c867bd34e151e90a111722f74bd91cf
commit: bc440d869326e303a9e77f5b9369b9b2636caf67 [49/55] Kbuild: enable more warnings by default
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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/arnd/playground.git/commit/?id=bc440d869326e303a9e77f5b9369b9b2636caf67
        git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground warnings-5.10-2
        git checkout bc440d869326e303a9e77f5b9369b9b2636caf67
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/build_bug.h:5,
                    from include/linux/bits.h:22,
                    from include/linux/ioport.h:13,
                    from include/linux/acpi.h:12,
                    from include/linux/i2c.h:13,
                    from include/drm/drm_crtc.h:28,
                    from include/drm/drm_atomic.h:31,
                    from drivers/gpu/drm/kmb/kmb_plane.c:6:
   include/linux/scatterlist.h: In function 'sg_set_buf':
   arch/m68k/include/asm/page_mm.h:174:49: warning: ordered comparison of pointer with null pointer [-Wextra]
     174 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
         |                                                 ^~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   include/linux/scatterlist.h:137:2: note: in expansion of macro 'BUG_ON'
     137 |  BUG_ON(!virt_addr_valid(buf));
         |  ^~~~~~
   include/linux/scatterlist.h:137:10: note: in expansion of macro 'virt_addr_valid'
     137 |  BUG_ON(!virt_addr_valid(buf));
         |          ^~~~~~~~~~~~~~~
   drivers/gpu/drm/kmb/kmb_plane.c: In function 'kmb_plane_atomic_disable':
>> drivers/gpu/drm/kmb/kmb_plane.c:128:20: warning: array subscript 3 is above array bounds of 'struct layer_status[1]' [-Warray-bounds]
     128 |   kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL2_ENABLE;
         |   ~~~~~~~~~~~~~~~~~^~~~~~~~~~
   drivers/gpu/drm/kmb/kmb_plane.c:125:20: warning: array subscript 2 is above array bounds of 'struct layer_status[1]' [-Warray-bounds]
     125 |   kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL1_ENABLE;
         |   ~~~~~~~~~~~~~~~~~^~~~~~~~~~
   drivers/gpu/drm/kmb/kmb_plane.c:122:20: warning: array subscript 1 is above array bounds of 'struct layer_status[1]' [-Warray-bounds]
     122 |   kmb->plane_status[plane_id].ctrl = LCD_CTRL_VL2_ENABLE;
         |   ~~~~~~~~~~~~~~~~~^~~~~~~~~~

vim +128 drivers/gpu/drm/kmb/kmb_plane.c

7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  107  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  108  static void kmb_plane_atomic_disable(struct drm_plane *plane,
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  109  				     struct drm_plane_state *state)
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  110  {
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  111  	struct kmb_plane *kmb_plane = to_kmb_plane(plane);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  112  	int plane_id = kmb_plane->id;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  113  	struct kmb_drm_private *kmb;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  114  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  115  	kmb = to_kmb(plane->dev);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  116  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  117  	switch (plane_id) {
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  118  	case LAYER_0:
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  119  		kmb->plane_status[plane_id].ctrl = LCD_CTRL_VL1_ENABLE;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  120  		break;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  121  	case LAYER_1:
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  122  		kmb->plane_status[plane_id].ctrl = LCD_CTRL_VL2_ENABLE;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  123  		break;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  124  	case LAYER_2:
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  125  		kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL1_ENABLE;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  126  		break;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  127  	case LAYER_3:
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04 @128  		kmb->plane_status[plane_id].ctrl = LCD_CTRL_GL2_ENABLE;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  129  		break;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  130  	}
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  131  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  132  	kmb->plane_status[plane_id].disable = true;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  133  }
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  134  

:::::: The code at line 128 was first introduced by commit
:::::: 7f7b96a8a0a185ad8b15ee1cf042f75aa1430c30 drm/kmb: Add support for KeemBay Display

:::::: TO: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
:::::: CC: Sam Ravnborg <sam@ravnborg.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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