linux-kernel - drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:864:13: warning: variable 'r' set but not used

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Date:   Tue, 9 Aug 2022 20:19:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jack Xiao <Jack.Xiao@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Hawking Zhang <Hawking.Zhang@....com>
Subject: drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:864:13: warning: variable
 'r' set but not used

Hi Jack,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   eb555cb5b794f4e12a9897f3d46d5a72104cd4a7
commit: e3652b0976f383dea912607a404e974632b019b1 drm/amdgpu/mes: add helper functions to alloc/free ctx metadata
date:   3 months ago
config: arc-randconfig-r043-20220808 (https://download.01.org/0day-ci/archive/20220809/202208092032.V6o0PjnJ-lkp@intel.com/config)
compiler: arceb-elf-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=e3652b0976f383dea912607a404e974632b019b1
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout e3652b0976f383dea912607a404e974632b019b1
        # 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=arc SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/

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

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:22,
                    from arch/arc/include/asm/bug.h:30,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/current.h:5,
                    from arch/arc/include/asm/current.h:20,
                    from include/linux/mutex.h:14,
                    from include/linux/kernfs.h:11,
                    from include/linux/sysfs.h:16,
                    from include/linux/kobject.h:20,
                    from include/linux/of.h:17,
                    from include/linux/irqdomain.h:35,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h:27,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h:27,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:24:
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c: In function 'amdgpu_mes_doorbell_init':
   include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:418:25: note: in definition of macro 'printk_index_wrap'
     418 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/drm/drm_print.h:494:9: note: in expansion of macro 'printk'
     494 |         printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO       KERN_SOH "6"    /* informational */
         |                         ^~~~~~~~
   include/drm/drm_print.h:494:22: note: in expansion of macro 'KERN_INFO'
     494 |         printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
         |                      ^~~~~
   include/drm/drm_print.h:498:9: note: in expansion of macro '_DRM_PRINTK'
     498 |         _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
         |         ^~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:131:9: note: in expansion of macro 'DRM_INFO'
     131 |         DRM_INFO("max_doorbell_slices=%ld\n", doorbell_process_limit);
         |         ^~~~~~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c: In function 'amdgpu_mes_ctx_alloc_meta_data':
>> drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c:864:13: warning: variable 'r' set but not used [-Wunused-but-set-variable]
     864 |         int r;
         |             ^


vim +/r +864 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c

   860	
   861	int amdgpu_mes_ctx_alloc_meta_data(struct amdgpu_device *adev,
   862					   struct amdgpu_mes_ctx_data *ctx_data)
   863	{
 > 864		int r;
   865	
   866		r = amdgpu_bo_create_kernel(adev,
   867				    sizeof(struct amdgpu_mes_ctx_meta_data),
   868				    PAGE_SIZE, AMDGPU_GEM_DOMAIN_GTT,
   869				    &ctx_data->meta_data_obj, NULL,
   870				    &ctx_data->meta_data_ptr);
   871		if (!ctx_data->meta_data_obj)
   872			return -ENOMEM;
   873	
   874		memset(ctx_data->meta_data_ptr, 0,
   875		       sizeof(struct amdgpu_mes_ctx_meta_data));
   876	
   877		return 0;
   878	}
   879	

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