tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/wip head: a76254f60dc69826643c45a19418b3e4c67d68f4 commit: 8e0c3933252fff31aaf97b37f660b1a3107debd2 [6/7] lockdep: Only trace IRQ edges config: s390-randconfig-s031-20200819 (attached as .config) compiler: s390-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: v0.6.2-183-gaa6ede3b-dirty git checkout 8e0c3933252fff31aaf97b37f660b1a3107debd2 # 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=s390 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 >>) kernel/trace/ring_buffer.c:923:32: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got int @@ kernel/trace/ring_buffer.c:923:32: sparse: expected restricted __poll_t kernel/trace/ring_buffer.c:923:32: sparse: got int kernel/trace/ring_buffer.c: note: in included file (through include/linux/irqflags.h, include/linux/spinlock.h, include/linux/mmzone.h, ...): # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue locking/wip git checkout 8e0c3933252fff31aaf97b37f660b1a3107debd2 vim +/ring_buffer_peek +68 arch/s390/include/asm/irqflags.h df9ee29270c11d arch/s390/include/asm/irqflags.h David Howells 2010-10-07 67 f433c4aec9999d arch/s390/include/asm/irqflags.h Steven Rostedt 2011-07-24 @68 static inline notrace bool arch_irqs_disabled_flags(unsigned long flags) 1f194a4c393103 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 69 { 204ee2c5643199 arch/s390/include/asm/irqflags.h Christian Borntraeger 2016-01-11 70 return !(flags & ARCH_IRQ_ENABLED); 1f194a4c393103 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 71 } 1f194a4c393103 include/asm-s390/irqflags.h Heiko Carstens 2006-07-03 72 :::::: The code at line 68 was first introduced by commit :::::: f433c4aec9999d1bf2ed8c328196f3b0ad5f75db [S390] irqs: Do not trace arch_local_{*,irq_*} functions :::::: TO: Steven Rostedt <srostedt(a)redhat.com&gt; :::::: CC: Martin Schwidefsky <schwidefsky(a)de.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org