tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7b4cb0a48db03a67d1ce21c4f97b1508a241a2e7 commit: bbfa112b46bdbbdfc2f5bfb9c2dcbef780ff6417 [7565/12611] READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() config: sh-randconfig-s032-20200526 (attached as .config) compiler: sh4-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-240-gf0fe1cd9-dirty git checkout bbfa112b46bdbbdfc2f5bfb9c2dcbef780ff6417 # save the attached .config to linux build tree make W=1 C=1 ARCH=sh 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 >>) kernel/events/ring_buffer.c:22:9: sparse: expected int volatile kernel/events/ring_buffer.c:22:9: sparse: got restricted __poll_t [usertype] kernel/events/ring_buffer.c:169:14: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer [noderef] <asn:4> * kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer * kernel/events/ring_buffer.c:169:14: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer [noderef] <asn:4> * kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer * kernel/events/ring_buffer.c:169:14: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer [noderef] <asn:4> * kernel/events/ring_buffer.c:169:14: sparse: struct perf_buffer * vim +22 kernel/events/ring_buffer.c 76369139ceb955 Frederic Weisbecker 2011-05-19 19 76369139ceb955 Frederic Weisbecker 2011-05-19 20 static void perf_output_wakeup(struct perf_output_handle *handle) 76369139ceb955 Frederic Weisbecker 2011-05-19 21 { a9a08845e9acbd Linus Torvalds 2018-02-11 @22 atomic_set(&handle->rb->poll, EPOLLIN); 76369139ceb955 Frederic Weisbecker 2011-05-19 23 76369139ceb955 Frederic Weisbecker 2011-05-19 24 handle->event->pending_wakeup = 1; 76369139ceb955 Frederic Weisbecker 2011-05-19 25 irq_work_queue(&handle->event->pending); 76369139ceb955 Frederic Weisbecker 2011-05-19 26 } 76369139ceb955 Frederic Weisbecker 2011-05-19 27 :::::: The code at line 22 was first introduced by commit :::::: a9a08845e9acbd224e4ee466f5c1275ed50054e8 vfs: do bulk POLL* -> EPOLL* replacement :::::: TO: Linus Torvalds <torvalds(a)linux-foundation.org&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