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Message-ID: <202511062223.ocoUvCBI-lkp@intel.com>
Date: Thu, 6 Nov 2025 22:38:04 +0800
From: kernel test robot <lkp@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 3/5] tracing: Have tracer option be instance specific
Hi Steven,
kernel test robot noticed the following build errors:
[auto build test ERROR on trace/for-next]
[cannot apply to linus/master v6.18-rc4 next-20251106]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/tracing-Remove-dummy-options-and-flags/20251106-010511
base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next
patch link: https://lore.kernel.org/r/20251105161935.545400234%40kernel.org
patch subject: [PATCH 3/5] tracing: Have tracer option be instance specific
config: i386-buildonly-randconfig-003-20251106 (https://download.01.org/0day-ci/archive/20251106/202511062223.ocoUvCBI-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251106/202511062223.ocoUvCBI-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511062223.ocoUvCBI-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
kernel/trace/trace.c: In function 'run_tracer_selftest':
>> kernel/trace/trace.c:2174:30: error: 'type' redeclared as different kind of symbol
2174 | struct trace_tracer *type = tracers->trace;
| ^~~~
kernel/trace/trace.c:2171:47: note: previous definition of 'type' with type 'struct tracer *'
2171 | static int run_tracer_selftest(struct tracer *type)
| ~~~~~~~~~~~~~~~^~~~
>> kernel/trace/trace.c:2174:37: error: 'tracers' undeclared (first use in this function)
2174 | struct trace_tracer *type = tracers->trace;
| ^~~~~~~
kernel/trace/trace.c:2174:37: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/trace/trace.c:2180:18: error: invalid use of undefined type 'struct trace_tracer'
2180 | if (!type->selftest || tracing_selftest_disabled)
| ^~
>> kernel/trace/trace.c:2189:38: error: passing argument 1 of 'save_selftest' from incompatible pointer type [-Wincompatible-pointer-types]
2189 | return save_selftest(type);
| ^~~~
| |
| struct trace_tracer *
kernel/trace/trace.c:2158:41: note: expected 'struct tracer *' but argument is of type 'struct trace_tracer *'
2158 | static int save_selftest(struct tracer *type)
| ~~~~~~~~~~~~~~~^~~~
In file included from include/asm-generic/bug.h:22,
from arch/x86/include/asm/bug.h:108,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/mm.h:6,
from include/linux/ring_buffer.h:5,
from kernel/trace/trace.c:15:
kernel/trace/trace.c:2193:29: error: invalid use of undefined type 'struct trace_tracer'
2193 | type->name);
| ^~
include/linux/printk.h:484:33: note: in definition of macro 'printk_index_wrap'
484 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:565:9: note: in expansion of macro 'printk'
565 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~
kernel/trace/trace.c:2192:17: note: in expansion of macro 'pr_warn'
2192 | pr_warn("Selftest for tracer %s skipped due to tracing disabled\n",
| ^~~~~~~
>> kernel/trace/trace.c:2206:27: error: assignment to 'struct tracer *' from incompatible pointer type 'struct trace_tracer *' [-Wincompatible-pointer-types]
2206 | tr->current_trace = type;
| ^
kernel/trace/trace.c:2207:39: error: invalid use of undefined type 'struct trace_tracer'
2207 | tr->current_trace_flags = type->flags ? : type->default_flags;
| ^~
kernel/trace/trace.c:2207:55: error: invalid use of undefined type 'struct trace_tracer'
2207 | tr->current_trace_flags = type->flags ? : type->default_flags;
| ^~
kernel/trace/trace.c:2210:17: error: invalid use of undefined type 'struct trace_tracer'
2210 | if (type->use_max_tr) {
| ^~
kernel/trace/trace.c:2220:44: error: invalid use of undefined type 'struct trace_tracer'
2220 | pr_info("Testing tracer %s: ", type->name);
| ^~
include/linux/printk.h:484:33: note: in definition of macro 'printk_index_wrap'
484 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:585:9: note: in expansion of macro 'printk'
585 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~
kernel/trace/trace.c:2220:9: note: in expansion of macro 'pr_info'
2220 | pr_info("Testing tracer %s: ", type->name);
| ^~~~~~~
kernel/trace/trace.c:2221:19: error: invalid use of undefined type 'struct trace_tracer'
2221 | ret = type->selftest(type, tr);
| ^~
kernel/trace/trace.c:2235:17: error: invalid use of undefined type 'struct trace_tracer'
2235 | if (type->use_max_tr) {
| ^~
>> kernel/trace/trace.c:2176:30: warning: unused variable 'flags' [-Wunused-variable]
2176 | struct tracer_flags *flags;
| ^~~~~
kernel/trace/trace.c: In function 'tracing_trace_options_show':
kernel/trace/trace.c:5172:24: warning: variable 'trace' set but not used [-Wunused-but-set-variable]
5172 | struct tracer *trace;
| ^~~~~
vim +/type +2174 kernel/trace/trace.c
2170
> 2171 static int run_tracer_selftest(struct tracer *type)
2172 {
2173 struct trace_array *tr = &global_trace;
> 2174 struct trace_tracer *type = tracers->trace;
2175 struct tracer_flags *saved_flags = tr->current_trace_flags;
> 2176 struct tracer_flags *flags;
2177 struct tracer *saved_tracer = tr->current_trace;
2178 int ret;
2179
> 2180 if (!type->selftest || tracing_selftest_disabled)
2181 return 0;
2182
2183 /*
2184 * If a tracer registers early in boot up (before scheduling is
2185 * initialized and such), then do not run its selftests yet.
2186 * Instead, run it a little later in the boot process.
2187 */
2188 if (!selftests_can_run)
> 2189 return save_selftest(type);
2190
2191 if (!tracing_is_on()) {
> 2192 pr_warn("Selftest for tracer %s skipped due to tracing disabled\n",
2193 type->name);
2194 return 0;
2195 }
2196
2197 /*
2198 * Run a selftest on this tracer.
2199 * Here we reset the trace buffer, and set the current
2200 * tracer to be this tracer. The tracer can then run some
2201 * internal tracing to verify that everything is in order.
2202 * If we fail, we do not register this tracer.
2203 */
2204 tracing_reset_online_cpus(&tr->array_buffer);
2205
> 2206 tr->current_trace = type;
2207 tr->current_trace_flags = type->flags ? : type->default_flags;
2208
2209 #ifdef CONFIG_TRACER_MAX_TRACE
2210 if (type->use_max_tr) {
2211 /* If we expanded the buffers, make sure the max is expanded too */
2212 if (tr->ring_buffer_expanded)
2213 ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size,
2214 RING_BUFFER_ALL_CPUS);
2215 tr->allocated_snapshot = true;
2216 }
2217 #endif
2218
2219 /* the test is responsible for initializing and enabling */
> 2220 pr_info("Testing tracer %s: ", type->name);
2221 ret = type->selftest(type, tr);
2222 /* the test is responsible for resetting too */
2223 tr->current_trace = saved_tracer;
2224 tr->current_trace_flags = saved_flags;
2225 if (ret) {
2226 printk(KERN_CONT "FAILED!\n");
2227 /* Add the warning after printing 'FAILED' */
2228 WARN_ON(1);
2229 return -1;
2230 }
2231 /* Only reset on passing, to avoid touching corrupted buffers */
2232 tracing_reset_online_cpus(&tr->array_buffer);
2233
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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