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 <[email protected]>
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/[email protected]
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 <[email protected]>
>
> 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/[email protected]
On Tue, May 26, 2020 at 09:11:17AM -0700, Paul E. McKenney wrote:
> 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 <[email protected]>
> >
> > 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
Thanks in advance, Paul, for the fix!
- Joel
> > 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/[email protected]
>
>