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Subject[rcu:dev.2020.05.25a 51/63] kernel/rcu/refperf.c:298:6: warning: no previous prototype for function 'reset_readers'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.05.25a
head: 1e9451642683146552713c5ce6d269ae378eacd5
commit: 786a25497743696d79592b864cafbfe48787e6e1 [51/63] refperf: Add a test to measure performance of read-side synchronization
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
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
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
git checkout 786a25497743696d79592b864cafbfe48787e6e1
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> kernel/rcu/refperf.c:298:6: warning: no previous prototype for function 'reset_readers' [-Wmissing-prototypes]
void reset_readers(int n)
^
kernel/rcu/refperf.c:298:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void reset_readers(int n)
^
static
>> kernel/rcu/refperf.c:311:5: warning: no previous prototype for function 'process_durations' [-Wmissing-prototypes]
u64 process_durations(int n)
^
kernel/rcu/refperf.c:311:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
u64 process_durations(int n)
^
static
2 warnings generated.

vim +/reset_readers +298 kernel/rcu/refperf.c

297
> 298 void reset_readers(int n)
299 {
300 int i;
301 struct reader_task *rt;
302
303 for (i = 0; i < n; i++) {
304 rt = &(reader_tasks[i]);
305
306 rt->last_duration_ns = 0;
307 }
308 }
309
310 // Print the results of each reader and return the sum of all their durations.
> 311 u64 process_durations(int n)
312 {
313 int i;
314 struct reader_task *rt;
315 char buf1[64];
316 char buf[512];
317 u64 sum = 0;
318
319 buf[0] = 0;
320 sprintf(buf, "Experiment #%d (Format: <THREAD-NUM>:<Total loop time in ns>)",
321 exp_idx);
322
323 for (i = 0; i <= n && !torture_must_stop(); i++) {
324 rt = &(reader_tasks[i]);
325 sprintf(buf1, "%d: %llu\t", i, rt->last_duration_ns);
326
327 if (i % 5 == 0)
328 strcat(buf, "\n");
329 strcat(buf, buf1);
330
331 sum += rt->last_duration_ns;
332 }
333 strcat(buf, "\n");
334
335 PERFOUT("%s\n", buf);
336
337 return sum;
338 }
339

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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