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Date: Wed, 6 Oct 2021 06:16:21 +0800
From: kernel test robot <lkp@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
0day robot <lkp@...el.com>
Subject: kernel/trace/ftrace.c:208: undefined reference to
`ftrace_ops_list_func'
tree: https://github.com/0day-ci/linux/commits/UPDATE-20211006-003617/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606
head: 200d9dd9fd167dae7f84464ff025b6d9bb2bc635
commit: 200d9dd9fd167dae7f84464ff025b6d9bb2bc635 ftrace: Fix -Wcast-function-type warnings on powerpc64
date: 6 hours ago
config: x86_64-randconfig-a012-20211004 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/0day-ci/linux/commit/200d9dd9fd167dae7f84464ff025b6d9bb2bc635
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review UPDATE-20211006-003617/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606
git checkout 200d9dd9fd167dae7f84464ff025b6d9bb2bc635
# save the attached .config to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
ld: kernel/trace/ftrace.o: in function `update_ftrace_function':
>> kernel/trace/ftrace.c:208: undefined reference to `ftrace_ops_list_func'
>> ld: kernel/trace/ftrace.c:216: undefined reference to `ftrace_ops_list_func'
ld: kernel/trace/ftrace.c:215: undefined reference to `ftrace_ops_list_func'
ld: kernel/trace/ftrace.c:235: undefined reference to `ftrace_ops_list_func'
vim +208 kernel/trace/ftrace.c
00ccbf2f5b7580 Steven Rostedt (Red Hat 2015-02-19 173)
2b499381bc50ed Steven Rostedt 2011-05-03 174 static void update_ftrace_function(void)
2b499381bc50ed Steven Rostedt 2011-05-03 175 {
2b499381bc50ed Steven Rostedt 2011-05-03 176 ftrace_func_t func;
2b499381bc50ed Steven Rostedt 2011-05-03 177
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 178) /*
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 179) * Prepare the ftrace_ops that the arch callback will use.
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 180) * If there's only one ftrace_ops registered, the ftrace_ops_list
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 181) * will point to the ops we want.
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 182) */
f86f418059b94a Chunyan Zhang 2017-06-07 183 set_function_trace_op = rcu_dereference_protected(ftrace_ops_list,
f86f418059b94a Chunyan Zhang 2017-06-07 184 lockdep_is_held(&ftrace_lock));
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 185)
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 186) /* If there's no ftrace_ops registered, just call the stub function */
f86f418059b94a Chunyan Zhang 2017-06-07 187 if (set_function_trace_op == &ftrace_list_end) {
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 188) func = ftrace_stub;
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 189)
cdbe61bfe70440 Steven Rostedt 2011-05-05 190 /*
cdbe61bfe70440 Steven Rostedt 2011-05-05 191 * If we are at the end of the list and this ops is
4740974a684415 Steven Rostedt 2012-07-20 192 * recursion safe and not dynamic and the arch supports passing ops,
4740974a684415 Steven Rostedt 2012-07-20 193 * then have the mcount trampoline call the function directly.
cdbe61bfe70440 Steven Rostedt 2011-05-05 194 */
f86f418059b94a Chunyan Zhang 2017-06-07 195 } else if (rcu_dereference_protected(ftrace_ops_list->next,
f86f418059b94a Chunyan Zhang 2017-06-07 196 lockdep_is_held(&ftrace_lock)) == &ftrace_list_end) {
00ccbf2f5b7580 Steven Rostedt (Red Hat 2015-02-19 197) func = ftrace_ops_get_list_func(ftrace_ops_list);
f7aad4e1a82212 Steven Rostedt (Red Hat 2014-09-10 198)
2f5f6ad9390c1e Steven Rostedt 2011-08-08 199 } else {
2f5f6ad9390c1e Steven Rostedt 2011-08-08 200 /* Just use the default ftrace_ops */
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 201) set_function_trace_op = &ftrace_list_end;
b848914ce39589 Steven Rostedt 2011-05-04 202 func = ftrace_ops_list_func;
2f5f6ad9390c1e Steven Rostedt 2011-08-08 203 }
2b499381bc50ed Steven Rostedt 2011-05-03 204
5f8bf2d263a20b Steven Rostedt (Red Hat 2014-07-15 205) update_function_graph_func();
5f8bf2d263a20b Steven Rostedt (Red Hat 2014-07-15 206)
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 207) /* If there's no change, then do nothing more here */
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 @208) if (ftrace_trace_function == func)
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 209) return;
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 210)
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 211) /*
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 212) * If we are using the list function, it doesn't care
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 213) * about the function_trace_ops.
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 214) */
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 215) if (func == ftrace_ops_list_func) {
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 @216) ftrace_trace_function = func;
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 217) /*
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 218) * Don't even bother setting function_trace_ops,
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 219) * it would be racy to do so anyway.
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 220) */
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 221) return;
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 222) }
405e1d834807e5 Steven Rostedt (Red Hat 2013-11-08 223)
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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