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: i386-randconfig-s002-20200819 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-183-gaa6ede3b-dirty git checkout 8e0c3933252fff31aaf97b37f660b1a3107debd2 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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/locking/spinlock.c:149:17: sparse: sparse: context imbalance in '_raw_spin_lock' - wrong count at exit kernel/locking/spinlock.c: note: in included file (through include/linux/preempt.h): kernel/locking/spinlock.c:173:17: sparse: sparse: context imbalance in '_raw_spin_lock_bh' - wrong count at exit kernel/locking/spinlock.c:181:17: sparse: sparse: context imbalance in '_raw_spin_unlock' - unexpected unlock kernel/locking/spinlock.c:189:17: sparse: sparse: context imbalance in '_raw_spin_unlock_irqrestore' - unexpected unlock kernel/locking/spinlock.c:197:17: sparse: sparse: context imbalance in '_raw_spin_unlock_irq' - unexpected unlock kernel/locking/spinlock.c:205:17: sparse: sparse: context imbalance in '_raw_spin_unlock_bh' - unexpected unlock kernel/locking/spinlock.c:221:17: sparse: sparse: context imbalance in '_raw_read_lock' - wrong count at exit kernel/locking/spinlock.c:245:17: sparse: sparse: context imbalance in '_raw_read_lock_bh' - wrong count at exit kernel/locking/spinlock.c:253:17: sparse: sparse: context imbalance in '_raw_read_unlock' - unexpected unlock kernel/locking/spinlock.c:261:17: sparse: sparse: context imbalance in '_raw_read_unlock_irqrestore' - unexpected unlock kernel/locking/spinlock.c:269:17: sparse: sparse: context imbalance in '_raw_read_unlock_irq' - unexpected unlock kernel/locking/spinlock.c:277:17: sparse: sparse: context imbalance in '_raw_read_unlock_bh' - unexpected unlock kernel/locking/spinlock.c:293:17: sparse: sparse: context imbalance in '_raw_write_lock' - wrong count at exit kernel/locking/spinlock.c:317:17: sparse: sparse: context imbalance in '_raw_write_lock_bh' - wrong count at exit kernel/locking/spinlock.c:325:17: sparse: sparse: context imbalance in '_raw_write_unlock' - unexpected unlock kernel/locking/spinlock.c:333:17: sparse: sparse: context imbalance in '_raw_write_unlock_irqrestore' - unexpected unlock kernel/locking/spinlock.c:341:17: sparse: sparse: context imbalance in '_raw_write_unlock_irq' - unexpected unlock kernel/locking/spinlock.c:349:17: sparse: sparse: context imbalance in '_raw_write_unlock_bh' - unexpected unlock kernel/locking/spinlock.c:358:17: sparse: sparse: context imbalance in '_raw_spin_lock_nested' - wrong count at exit kernel/locking/spinlock.c:380:17: sparse: sparse: context imbalance in '_raw_spin_lock_nest_lock' - wrong count at exit -- 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, arch/x86/include/asm/special_insns.h, arch/x86/include/asm/processor.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 +/_raw_spin_lock_irqsave +79 arch/x86/include/asm/preempt.h c2daa3bed53a81 Peter Zijlstra 2013-08-14 72 c2daa3bed53a81 Peter Zijlstra 2013-08-14 73 /* c2daa3bed53a81 Peter Zijlstra 2013-08-14 74 * The various preempt_count add/sub methods c2daa3bed53a81 Peter Zijlstra 2013-08-14 75 */ c2daa3bed53a81 Peter Zijlstra 2013-08-14 76 c2daa3bed53a81 Peter Zijlstra 2013-08-14 77 static __always_inline void __preempt_count_add(int val) c2daa3bed53a81 Peter Zijlstra 2013-08-14 78 { b3ca1c10d7b32f Christoph Lameter 2014-04-07 @79 raw_cpu_add_4(__preempt_count, val); c2daa3bed53a81 Peter Zijlstra 2013-08-14 80 } c2daa3bed53a81 Peter Zijlstra 2013-08-14 81 :::::: The code at line 79 was first introduced by commit :::::: b3ca1c10d7b32fdfdfaf5484eda486323f52d9be percpu: add raw_cpu_ops :::::: TO: Christoph Lameter <cl(a)linux.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org