[PATCH 2/4] disp/msm/dpu: add support to dump dpu registers

[kernel test robot]

Hi Abhinav,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-exynos/exynos-drm-next]
[also build test WARNING on drm-intel/for-linux-next tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master v5.9 next-20201022]
[cannot apply to drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Abhinav-Kumar/Add-devcoredump-support-for-DPU/20201022-130507
base:   https://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git exynos-drm-next
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-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://github.com/0day-ci/linux/commit/a7e6907c303a46ea8422fc3c414c22fdfb45d49f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Abhinav-Kumar/Add-devcoredump-support-for-DPU/20201022-130507
        git checkout a7e6907c303a46ea8422fc3c414c22fdfb45d49f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/msm/disp/dpu1/dpu_dbg.c: In function 'dpu_dbg_dump':
>> drivers/gpu/drm/msm/disp/dpu1/dpu_dbg.c:115:6: warning: variable 'i' set but not used [-Wunused-but-set-variable]
     115 |  int i, index = 0;
         |      ^

vim +/i +115 drivers/gpu/drm/msm/disp/dpu1/dpu_dbg.c

   112	
   113	void dpu_dbg_dump(enum dpu_dbg_dump_context dump_mode, const char *name, ...)
   114	{
 > 115		int i, index = 0;
   116		bool do_panic = false;
   117		bool dump_all = false;
   118		va_list args;
   119		char *blk_name = NULL;
   120		struct dpu_dbg_reg_base *blk_base = NULL;
   121		struct dpu_dbg_reg_base **blk_arr;
   122		u32 blk_len;
   123	
   124		/*
   125		 * if there is a coredump pending return immediately till dump
   126		 * if read by userspace or timeout happens
   127		 */
   128		if (((dpu_dbg.enable_reg_dump == DPU_DBG_DUMP_IN_MEM) ||
   129			 (dpu_dbg.enable_reg_dump == DPU_DBG_DUMP_IN_COREDUMP)) &&
   130			dpu_dbg.coredump_pending) {
   131			pr_debug("coredump is pending read\n");
   132			return;
   133		}
   134	
   135		blk_arr = &dpu_dbg.req_dump_blks[0];
   136		blk_len = ARRAY_SIZE(dpu_dbg.req_dump_blks);
   137	
   138		memset(dpu_dbg.req_dump_blks, 0,
   139				sizeof(dpu_dbg.req_dump_blks));
   140		dpu_dbg.dump_all = false;
   141		dpu_dbg.dump_mode = dump_mode;
   142	
   143		va_start(args, name);
   144		i = 0;
   145		while ((blk_name = va_arg(args, char*))) {
   146	
   147			if (IS_ERR_OR_NULL(blk_name))
   148				break;
   149	
   150			blk_base = _dpu_dump_get_blk_addr(&dpu_dbg, blk_name);
   151			if (blk_base) {
   152				if (index < blk_len) {
   153					blk_arr[index] = blk_base;
   154					index++;
   155				} else {
   156					pr_err("insufficient space to dump %s\n",
   157							blk_name);
   158				}
   159			}
   160	
   161			if (!strcmp(blk_name, "all"))
   162				dump_all = true;
   163	
   164			if (!strcmp(blk_name, "panic"))
   165				do_panic = true;
   166	
   167		}
   168		va_end(args);
   169	
   170		dpu_dbg.work_panic = do_panic;
   171		dpu_dbg.dump_all = dump_all;
   172	
   173		kthread_queue_work(dpu_dbg.dump_worker,
   174				&dpu_dbg.dump_work);
   175	

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