On Tue, May 26, 2020 at 08:07:35PM +0800, kbuild test robot wrote:
> 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 <l...@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.
Good catches, fixing!
Thanx, Paul
> 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-...@lists.01.org
