Re: [PATCH v7 4/9] drm/panic: Add drm_panic_is_format_supported()

From: kernel test robot <lkp@intel.com>
To: Jocelyn Falempe <jfalempe@redhat.com>,
	dri-devel@lists.freedesktop.org, tzimmermann@suse.de,
	airlied@redhat.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, daniel@ffwll.ch, javierm@redhat.com,
	bluescreen_avenger@verizon.net, noralf@tronnes.org
Cc: oe-kbuild-all@lists.linux.dev, gpiccoli@igalia.com,
	Jocelyn Falempe <jfalempe@redhat.com>
Subject: Re: [PATCH v7 4/9] drm/panic: Add drm_panic_is_format_supported()
Date: Fri, 5 Jan 2024 13:45:46 +0800	[thread overview]
Message-ID: <202401051328.IW9dwjX4-lkp@intel.com> (raw)
In-Reply-To: <20240104160301.185915-5-jfalempe@redhat.com>

Hi Jocelyn,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 50a3c772bd927dd409c484832ddd9f6bf00b7389]

url:    https://github.com/intel-lab-lkp/linux/commits/Jocelyn-Falempe/drm-format-helper-Add-drm_fb_blit_from_r1-and-drm_fb_fill/20240105-001038
base:   50a3c772bd927dd409c484832ddd9f6bf00b7389
patch link:    https://lore.kernel.org/r/20240104160301.185915-5-jfalempe%40redhat.com
patch subject: [PATCH v7 4/9] drm/panic: Add drm_panic_is_format_supported()
config: hexagon-randconfig-r071-20240105 (https://download.01.org/0day-ci/archive/20240105/202401051328.IW9dwjX4-lkp@intel.com/config)
compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project 7e186d366d6c7def0543acc255931f617e76dff0)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240105/202401051328.IW9dwjX4-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401051328.IW9dwjX4-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_drv.c:38:
   In file included from include/drm/drm_accel.h:11:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     547 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     560 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/gpu/drm/drm_drv.c:38:
   In file included from include/drm/drm_accel.h:11:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     573 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/gpu/drm/drm_drv.c:38:
   In file included from include/drm/drm_accel.h:11:
   In file included from include/drm/drm_file.h:39:
   In file included from include/drm/drm_prime.h:37:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     584 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     594 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     604 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   In file included from drivers/gpu/drm/drm_drv.c:46:
>> include/drm/drm_panic.h:97:6: warning: no previous prototype for function 'drm_panic_is_format_supported' [-Wmissing-prototypes]
      97 | bool drm_panic_is_format_supported(u32 format) {return false; }
         |      ^
   include/drm/drm_panic.h:97:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      97 | bool drm_panic_is_format_supported(u32 format) {return false; }
         | ^
         | static 
   7 warnings generated.

vim +/drm_panic_is_format_supported +97 include/drm/drm_panic.h

    96	
  > 97	bool drm_panic_is_format_supported(u32 format) {return false; }
    98	

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