tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 00e4db51259a5f936fec1424b884f029479d3981 commit: 632ca50f2cbd8809a2fc1934b4b2c9c49bd55e98 af_packet: TPACKET_V3: replace busy-wait loop date: 4 weeks ago config: arm64-randconfig-s032-20200811 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-168-g9554805c-dirty git checkout 632ca50f2cbd8809a2fc1934b4b2c9c49bd55e98 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) net/packet/af_packet.c: note: in included file (through include/linux/spinlock_api_smp.h, include/linux/spinlock.h, include/linux/mmzone.h, ...): net/packet/af_packet.c:1001:9: sparse: sparse: context imbalance in 'prb_fill_curr_block' - wrong count at exit net/packet/af_packet.c: note: in included file (through arch/arm64/include/asm/smp.h, include/linux/smp.h, arch/arm64/include/asm/arch_timer.h, ...): arch/arm64/include/asm/percpu.h:112:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ff) arch/arm64/include/asm/percpu.h:112:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ffff) vim +/prb_clear_blk_fill_status +226 include/linux/rwlock_api_smp.h 6b6b4792f89346 Thomas Gleixner 2009-11-16 222 9c1721aa4994f6 Thomas Gleixner 2009-12-03 223 static inline void __raw_read_unlock(rwlock_t *lock) 6b6b4792f89346 Thomas Gleixner 2009-11-16 224 { 5facae4f3549b5 Qian Cai 2019-09-19 225 rwlock_release(&lock->dep_map, _RET_IP_); 9828ea9d75c38f Thomas Gleixner 2009-12-03 @226 do_raw_read_unlock(lock); 6b6b4792f89346 Thomas Gleixner 2009-11-16 227 preempt_enable(); 6b6b4792f89346 Thomas Gleixner 2009-11-16 228 } 6b6b4792f89346 Thomas Gleixner 2009-11-16 229 :::::: The code at line 226 was first introduced by commit :::::: 9828ea9d75c38fe3dce05d00566eed61c85732e6 locking: Further name space cleanups :::::: TO: Thomas Gleixner <tglx(a)linutronix.de&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org