tree: git://anongit.freedesktop.org/drm-intel topic/core-for-CI head: d0435a9b45070b945578c093dcd363b6b73a502c commit: cbc1ad45be43de36150fd98dae644fc89a69a5a0 [2/20] lockdep: Up MAX_LOCKDEP_CHAINS reproduce: # apt-get install sparse # sparse version: v0.6.1-191-gc51a0382-dirty git checkout cbc1ad45be43de36150fd98dae644fc89a69a5a0 make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +2744 kernel/locking/lockdep.c 810507fe6fd5ff Waiman Long 2020-02-06 2736 810507fe6fd5ff Waiman Long 2020-02-06 2737 static inline void init_chain_block(int offset, int next, int bucket, int size) 810507fe6fd5ff Waiman Long 2020-02-06 2738 { 810507fe6fd5ff Waiman Long 2020-02-06 2739 chain_hlocks[offset] = (next >> 16) | CHAIN_BLK_FLAG; 810507fe6fd5ff Waiman Long 2020-02-06 2740 chain_hlocks[offset + 1] = (u16)next; 810507fe6fd5ff Waiman Long 2020-02-06 2741 810507fe6fd5ff Waiman Long 2020-02-06 2742 if (size && !bucket) { 810507fe6fd5ff Waiman Long 2020-02-06 2743 chain_hlocks[offset + 2] = size >> 16; 810507fe6fd5ff Waiman Long 2020-02-06 @2744 chain_hlocks[offset + 3] = (u16)size; 810507fe6fd5ff Waiman Long 2020-02-06 2745 } 810507fe6fd5ff Waiman Long 2020-02-06 2746 } 810507fe6fd5ff Waiman Long 2020-02-06 2747 :::::: The code at line 2744 was first introduced by commit :::::: 810507fe6fd5ff3de429121adff49523fabb643a locking/lockdep: Reuse freed chain_hlocks entries :::::: TO: Waiman Long <longman(a)redhat.com&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org