linux-kernel - [rcu:dev.2020.05.25a 51/63] kernel/rcu/refperf.c:298:6: warning: no previous prototype for function 'reset

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Date:   Tue, 26 May 2020 20:07:35 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>
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@...el.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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