tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.10.y-rt-rebase head: 2cfd047db877d0ee7d2ff6c3e8c065d7e4be7533 commit: 1b5d4df5a260fa0224e9633a12d88770d56f99e6 [77/261] tracing: Merge irqflags + preemt counter, add RT bits config: mips-randconfig-r011-20201217 (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.10.y-rt-rebase git checkout 1b5d4df5a260fa0224e9633a12d88770d56f99e6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel/trace/trace_branch.c: In function 'probe_likely_condition': 64 | event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH, | ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from kernel/trace/trace_branch.c:18: kernel/trace/trace.h:766:1: note: declared here 766 | trace_buffer_lock_reserve(struct trace_buffer *buffer, | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_branch.c: At top level: kernel/trace/trace_branch.c:205:6: warning: no previous prototype for 'ftrace_likely_update' [-Wmissing-prototypes] 205 | void ftrace_likely_update(struct ftrace_likely_data *f, int val, | ^~~~~~~~~~~~~~~~~~~~ vim +/trace_buffer_lock_reserve +64 kernel/trace/trace_branch.c 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 29 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 30 static void 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 31) probe_likely_condition(struct ftrace_likely_data *f, int val, int expect) 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 32 { 2425bcb9240f8c9 kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-05-05 33) struct trace_event_call *call = &event_branch; 9f029e83e968e56 kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 34 struct trace_array *tr = branch_tracer; 13292494379f92f kernel/trace/trace_branch.c Steven Rostedt (VMware 2019-12-13 35) struct trace_buffer *buffer; a7603ff4b5f7e26 kernel/trace/trace_branch.c Steven Rostedt 2012-08-06 36 struct trace_array_cpu *data; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 37 struct ring_buffer_event *event; 9f029e83e968e56 kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 38 struct trace_branch *entry; 0a9877514c4fed1 kernel/trace/trace_branch.c Arnaldo Carvalho de Melo 2009-02-05 39 unsigned long flags; 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 40) int pc; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 41 const char *p; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 42 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 43) if (current->trace_recursion & TRACE_BRANCH_BIT) 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 44) return; 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 45) 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 46 /* 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 47 * I would love to save just the ftrace_likely_data pointer, but 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 48 * this code can also be used by modules. Ugly things can happen 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 49 * if the module is unloaded, and then we go and read the 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 50 * pointer. This is slower, but much safer. 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 51 */ 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 52 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 53 if (unlikely(!tr)) 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 54 return; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 55 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 56) raw_local_irq_save(flags); 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 57) current->trace_recursion |= TRACE_BRANCH_BIT; 1c5eb4481e0151d kernel/trace/trace_branch.c Steven Rostedt (VMware 2020-01-09 58) data = this_cpu_ptr(tr->array_buffer.data); 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 59) if (atomic_read(&data->disabled)) 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 60 goto out; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 61 51a763dd84253ba kernel/trace/trace_branch.c Arnaldo Carvalho de Melo 2009-02-05 62 pc = preempt_count(); 1c5eb4481e0151d kernel/trace/trace_branch.c Steven Rostedt (VMware 2020-01-09 63) buffer = tr->array_buffer.buffer; 8f6e8a314ab37ca kernel/trace/trace_branch.c Steven Rostedt 2009-10-07 @64 event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH, 51a763dd84253ba kernel/trace/trace_branch.c Arnaldo Carvalho de Melo 2009-02-05 65 sizeof(*entry), flags, pc); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 66 if (!event) 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 67 goto out; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 68 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 69 entry = ring_buffer_event_data(event); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 70 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 71 /* Strip off the path, only save the file */ 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 72) p = f->data.file + strlen(f->data.file); 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 73) while (p >= f->data.file && *p != '/') 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 74 p--; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 75 p++; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 76 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 77) strncpy(entry->func, f->data.func, TRACE_FUNC_SIZE); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 78 strncpy(entry->file, p, TRACE_FILE_SIZE); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 79 entry->func[TRACE_FUNC_SIZE] = 0; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 80 entry->file[TRACE_FILE_SIZE] = 0; 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 81) entry->constant = f->constant; 068f530b3f274d3 kernel/trace/trace_branch.c Steven Rostedt (VMware 2017-01-19 82) entry->line = f->data.line; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 83 entry->correct = val == expect; 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 84 f306cc82a93d6b1 kernel/trace/trace_branch.c Tom Zanussi 2013-10-24 85 if (!call_filter_check_discard(call, entry, buffer, event)) 52ffabe3848a1eb kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2016-11-23 86) trace_buffer_unlock_commit_nostack(buffer, event); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 87 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 88 out: 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 89) current->trace_recursion &= ~TRACE_BRANCH_BIT; 6224beb12e190ff kernel/trace/trace_branch.c Steven Rostedt (Red Hat 2015-07-07 90) raw_local_irq_restore(flags); 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 91 } 52f232cb720a7ba kernel/trace/trace_unlikely.c Steven Rostedt 2008-11-12 92 :::::: The code at line 64 was first introduced by commit :::::: 8f6e8a314ab37cadd72da5ace9027f2d04aba854 tracing: user local buffer variable for trace branch tracer :::::: TO: Steven Rostedt <srostedt(a)redhat.com&gt; :::::: CC: Steven Rostedt <rostedt(a)goodmis.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org