tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core head: f2a10095dea5043022f47aea7e0c7bea6c696a13 commit: 9702d805bb8f2b491034828186758a1bc77fce84 [5/7] perf: Allow using AUX data in perf samples config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 9702d805bb8f2b491034828186758a1bc77fce84 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sh If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/kernel.h:11:0, from include/linux/list.h:9, from include/linux/wait.h:7, from include/linux/wait_bit.h:8, from include/linux/fs.h:6, from kernel//events/core.c:11: kernel//events/core.c: In function 'perf_pmu_snapshot_aux': WRITE_ONCE(rb->aux_in_sampling, 1); ^ include/linux/compiler.h:286:17: note: in definition of macro 'WRITE_ONCE' union { typeof(x) __val; char __c[1]; } __u = \ ^ kernel//events/core.c:6299:13: note: each undeclared identifier is reported only once for each function it appears in WRITE_ONCE(rb->aux_in_sampling, 1); ^ include/linux/compiler.h:286:17: note: in definition of macro 'WRITE_ONCE' union { typeof(x) __val; char __c[1]; } __u = \ ^ kernel//events/core.c: In function 'perf_event_create_kernel_counter': kernel//events/core.c:11589:10: warning: return makes pointer from integer without a cast [-Wint-conversion] return -EINVAL; ^ vim +6299 kernel//events/core.c 6277 6278 long perf_pmu_snapshot_aux(struct perf_event *event, 6279 struct perf_output_handle *handle, 6280 unsigned long size) 6281 { 6282 unsigned long flags; 6283 long ret; 6284 6285 /* 6286 * Normal ->start()/->stop() callbacks run in IRQ mode in scheduler 6287 * paths. If we start calling them in NMI context, they may race with 6288 * the IRQ ones, that is, for example, re-starting an event that's just 6289 * been stopped, which is why we're using a separate callback that 6290 * doesn't change the event state. 6291 * 6292 * IRQs need to be disabled to prevent IPIs from racing with us. 6293 */ 6294 local_irq_save(flags); 6295 /* 6296 * Guard against NMI hits inside the critical section; 6297 * see also perf_prepare_sample_aux(). 6298 */ 6300 barrier(); 6301 6302 ret = event->pmu->snapshot_aux(event, handle, size); 6303 6304 barrier(); 6305 WRITE_ONCE(rb->aux_in_sampling, 0); 6306 local_irq_restore(flags); 6307 6308 return ret; 6309 } 6310 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation