linux-kernel - [ammarfaizi2-block:tglx/devel/x86/amperf 7/10] arch/x86/kernel/cpu/aperfmperf.c:502:6: warning: no previous prototype for function 'arch_scale_freq

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Message-ID: <202204201130.1qUqMmBQ-lkp@intel.com>
Date:   Wed, 20 Apr 2022 12:04:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:tglx/devel/x86/amperf 7/10]
 arch/x86/kernel/cpu/aperfmperf.c:502:6: warning: no previous prototype for
 function 'arch_scale_freq_tick'

tree:   https://github.com/ammarfaizi2/linux-block tglx/devel/x86/amperf
head:   9968b9bf69c36ec939d25ac6e0cc8e1d52075490
commit: 1d1a6fffce4ecc387d657ef959e5b7519098265e [7/10] x86/aperfmperf: Make parts of the frequency invariance code unconditional
config: x86_64-randconfig-a012 (https://download.01.org/0day-ci/archive/20220420/202204201130.1qUqMmBQ-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project bac6cd5bf85669e3376610cfc4c4f9ca015e7b9b)
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/ammarfaizi2/linux-block/commit/1d1a6fffce4ecc387d657ef959e5b7519098265e
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tglx/devel/x86/amperf
        git checkout 1d1a6fffce4ecc387d657ef959e5b7519098265e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/cpu/

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 >>):

>> arch/x86/kernel/cpu/aperfmperf.c:502:6: warning: no previous prototype for function 'arch_scale_freq_tick' [-Wmissing-prototypes]
   void arch_scale_freq_tick(void)
        ^
   arch/x86/kernel/cpu/aperfmperf.c:502:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void arch_scale_freq_tick(void)
   ^
   static 
   1 warning generated.


vim +/arch_scale_freq_tick +502 arch/x86/kernel/cpu/aperfmperf.c

a700c9188e7c84 Thomas Gleixner 2022-04-13  501  
a700c9188e7c84 Thomas Gleixner 2022-04-13 @502  void arch_scale_freq_tick(void)
a700c9188e7c84 Thomas Gleixner 2022-04-13  503  {
a700c9188e7c84 Thomas Gleixner 2022-04-13  504  	struct aperfmperf *s = this_cpu_ptr(&cpu_samples);
a700c9188e7c84 Thomas Gleixner 2022-04-13  505  	u64 acnt, mcnt, aperf, mperf;
a700c9188e7c84 Thomas Gleixner 2022-04-13  506  
1d1a6fffce4ecc Thomas Gleixner 2022-04-13  507  	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
a700c9188e7c84 Thomas Gleixner 2022-04-13  508  		return;
a700c9188e7c84 Thomas Gleixner 2022-04-13  509  
a700c9188e7c84 Thomas Gleixner 2022-04-13  510  	rdmsrl(MSR_IA32_APERF, aperf);
a700c9188e7c84 Thomas Gleixner 2022-04-13  511  	rdmsrl(MSR_IA32_MPERF, mperf);
a700c9188e7c84 Thomas Gleixner 2022-04-13  512  	acnt = aperf - s->aperf;
a700c9188e7c84 Thomas Gleixner 2022-04-13  513  	mcnt = mperf - s->mperf;
a700c9188e7c84 Thomas Gleixner 2022-04-13  514  
a700c9188e7c84 Thomas Gleixner 2022-04-13  515  	s->aperf = aperf;
a700c9188e7c84 Thomas Gleixner 2022-04-13  516  	s->mperf = mperf;
a700c9188e7c84 Thomas Gleixner 2022-04-13  517  
a700c9188e7c84 Thomas Gleixner 2022-04-13  518  	scale_freq_tick(acnt, mcnt);
a700c9188e7c84 Thomas Gleixner 2022-04-13  519  }
1d1a6fffce4ecc Thomas Gleixner 2022-04-13  520  

:::::: The code at line 502 was first introduced by commit
:::::: a700c9188e7c842054b480a303988ea37e111e8b x86/aperfmperf: Restructure arch_scale_freq_tick()

:::::: TO: Thomas Gleixner <tglx@...utronix.de>
:::::: CC: Thomas Gleixner <tglx@...utronix.de>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp