linux-kernel - [tip:x86/cleanups 7/11] arch/x86/kernel/cpu/aperfmperf.c:502:6: warning: no previous prototype for 'arch_scale_freq

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Date:   Sun, 1 May 2022 01:51:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: [tip:x86/cleanups 7/11] arch/x86/kernel/cpu/aperfmperf.c:502:6:
 warning: no previous prototype for 'arch_scale_freq_tick'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cleanups
head:   fb4c77c21aba03677f283acda3cae748ef866abf
commit: bb6e89df9028b2fab0ce6ac71cd9ef25b6ada32d [7/11] x86/aperfmperf: Make parts of the frequency invariance code unconditional
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220501/202205010106.06xRBR2C-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=bb6e89df9028b2fab0ce6ac71cd9ef25b6ada32d
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip x86/cleanups
        git checkout bb6e89df9028b2fab0ce6ac71cd9ef25b6ada32d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 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 'arch_scale_freq_tick' [-Wmissing-prototypes]
     502 | void arch_scale_freq_tick(void)
         |      ^~~~~~~~~~~~~~~~~~~~


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

73a5fa7d51366a Thomas Gleixner 2022-04-15  501  
73a5fa7d51366a Thomas Gleixner 2022-04-15 @502  void arch_scale_freq_tick(void)
73a5fa7d51366a Thomas Gleixner 2022-04-15  503  {
73a5fa7d51366a Thomas Gleixner 2022-04-15  504  	struct aperfmperf *s = this_cpu_ptr(&cpu_samples);
73a5fa7d51366a Thomas Gleixner 2022-04-15  505  	u64 acnt, mcnt, aperf, mperf;
73a5fa7d51366a Thomas Gleixner 2022-04-15  506  
bb6e89df9028b2 Thomas Gleixner 2022-04-15  507  	if (!cpu_feature_enabled(X86_FEATURE_APERFMPERF))
73a5fa7d51366a Thomas Gleixner 2022-04-15  508  		return;
73a5fa7d51366a Thomas Gleixner 2022-04-15  509  
73a5fa7d51366a Thomas Gleixner 2022-04-15  510  	rdmsrl(MSR_IA32_APERF, aperf);
73a5fa7d51366a Thomas Gleixner 2022-04-15  511  	rdmsrl(MSR_IA32_MPERF, mperf);
73a5fa7d51366a Thomas Gleixner 2022-04-15  512  	acnt = aperf - s->aperf;
73a5fa7d51366a Thomas Gleixner 2022-04-15  513  	mcnt = mperf - s->mperf;
73a5fa7d51366a Thomas Gleixner 2022-04-15  514  
73a5fa7d51366a Thomas Gleixner 2022-04-15  515  	s->aperf = aperf;
73a5fa7d51366a Thomas Gleixner 2022-04-15  516  	s->mperf = mperf;
73a5fa7d51366a Thomas Gleixner 2022-04-15  517  
73a5fa7d51366a Thomas Gleixner 2022-04-15  518  	scale_freq_tick(acnt, mcnt);
73a5fa7d51366a Thomas Gleixner 2022-04-15  519  }
bb6e89df9028b2 Thomas Gleixner 2022-04-15  520  

:::::: The code at line 502 was first introduced by commit
:::::: 73a5fa7d51366a549a9f2e3ee875ae51aa0b5580 x86/aperfmperf: Restructure arch_scale_freq_tick()

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

-- 
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