linux-kernel - [hnaz-mm:master 478/481] kernel/synchro-test.c:393:49: warning: variable 'zeros' set but not used

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Date:   Tue, 29 Mar 2022 22:02:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...e.hu>, Adrian Bunk <bunk@...sta.de>,
        Randy Dunlap <rdunlap@...otime.net>,
        Michel Lespinasse <walken@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [hnaz-mm:master 478/481] kernel/synchro-test.c:393:49: warning:
 variable 'zeros' set but not used

tree:   https://github.com/hnaz/linux-mm master
head:   673977c1d5c4c5bc15abf8f01ebaddc66116a9cd
commit: 52880bd2b8272052d5ccf95f94704a959796c9f6 [478/481] mutex subsystem, synchro-test module
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20220329/202203292115.plWUiMYU-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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
        # https://github.com/hnaz/linux-mm/commit/52880bd2b8272052d5ccf95f94704a959796c9f6
        git remote add hnaz-mm https://github.com/hnaz/linux-mm
        git fetch --no-tags hnaz-mm master
        git checkout 52880bd2b8272052d5ccf95f94704a959796c9f6
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   kernel/synchro-test.c:267:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&sp_comp[N], 0);
           ^
   kernel/synchro-test.c:268:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   kernel/synchro-test.c:288:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&mx_comp[N], 0);
           ^
   kernel/synchro-test.c:289:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   kernel/synchro-test.c:309:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&sm_comp[N], 0);
           ^
   kernel/synchro-test.c:310:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   kernel/synchro-test.c:332:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&rd_comp[N], 0);
           ^
   kernel/synchro-test.c:333:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   kernel/synchro-test.c:355:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&wr_comp[N], 0);
           ^
   kernel/synchro-test.c:356:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
   kernel/synchro-test.c:383:2: error: implicit declaration of function 'complete_and_exit' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           complete_and_exit(&dg_comp[N], 0);
           ^
   kernel/synchro-test.c:384:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
>> kernel/synchro-test.c:393:49: warning: variable 'zeros' set but not used [-Wunused-but-set-variable]
           unsigned int tot = 0, max = 0, min = UINT_MAX, zeros = 0, cnt;
                                                          ^
   1 warning and 12 errors generated.


vim +/zeros +393 kernel/synchro-test.c

   390	
   391	static unsigned int total(const char *what, unsigned int counts[], int num)
   392	{
 > 393		unsigned int tot = 0, max = 0, min = UINT_MAX, zeros = 0, cnt;
   394		int loop;
   395	
   396		for (loop = 0; loop < num; loop++) {
   397			cnt = counts[loop];
   398	
   399			if (cnt == 0) {
   400				zeros++;
   401				min = 0;
   402				continue;
   403			}
   404	
   405			tot += cnt;
   406			if (tot > max)
   407				max = tot;
   408			if (tot < min)
   409				min = tot;
   410		}
   411	
   412		if (verbose && tot > 0) {
   413			printk("%s:", what);
   414	
   415			for (loop = 0; loop < num; loop++) {
   416				cnt = counts[loop];
   417	
   418				if (cnt == 0)
   419					printk(" zzz");
   420				else
   421					printk(" %d%%", cnt * 100 / tot);
   422			}
   423	
   424			printk("\n");
   425		}
   426	
   427		return tot;
   428	}
   429	

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