Hi Mahesh, [auto build test WARNING on next-20161123] [cannot apply to drm-intel/for-linux-next v4.9-rc6 v4.9-rc5 v4.9-rc4 v4.9-rc6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Mahesh-Kumar/GEN-9-Arbitrated-Bandwidth-WM-WA-s-IPC/20161124-172826 config: x86_64-randconfig-x012-201647 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/i915_drv.c: In function 'i915_driver_load': >> drivers/gpu/drm/i915/i915_drv.c:1049:47: warning: 'ch1_rank' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ch0_rank == DRAM_RANK_SINGLE || ch1_rank == DRAM_RANK_SINGLE) ~~~~~~~~~^~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/i915_drv.c:1013:22: note: 'ch1_rank' was declared here enum rank ch0_rank, ch1_rank; ^~~~~~~~ >> drivers/gpu/drm/i915/i915_drv.c:1049:15: warning: 'ch0_rank' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ch0_rank == DRAM_RANK_SINGLE || ch1_rank == DRAM_RANK_SINGLE) ~~~~~~~~~^~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/i915_drv.c:1013:12: note: 'ch0_rank' was declared here enum rank ch0_rank, ch1_rank; ^~~~~~~~ vim +/ch1_rank +1049 drivers/gpu/drm/i915/i915_drv.c 1033 return -EINVAL; 1034 } 1035 1036 memdev_info->bandwidth_kbps = (memdev_info->num_channels * 1037 mem_freq_khz * 8); 1038 1039 if (memdev_info->bandwidth_kbps == 0) { 1040 DRM_ERROR("Couldn't get system memory bandwidth\n"); 1041 return -EINVAL; 1042 } 1043 memdev_info->valid = true; 1044 1045 /* 1046 * If any of channel is single rank channel, 1047 * consider single rank memory 1048 */ > 1049 if (ch0_rank == DRAM_RANK_SINGLE || ch1_rank == DRAM_RANK_SINGLE) 1050 memdev_info->rank = DRAM_RANK_SINGLE; 1051 else 1052 memdev_info->rank = max(ch0_rank, ch1_rank); 1053 1054 return 0; 1055 } 1056 1057 static int --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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