linux-kernel - [tip:tmp.smp/hotplug 32/61] arch/x86/kvm/x86.c:5665:15: warning: unused variable 'cpu'

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Date:	Tue, 12 Jul 2016 01:40:04 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	tipbuild@...or.com, Ingo Molnar <mingo@...nel.org>,
	Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [tip:tmp.smp/hotplug 32/61] arch/x86/kvm/x86.c:5665:15: warning:
 unused variable 'cpu'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.smp/hotplug
head:   b0cafca43cf443e8134f60b19bc1efe4ddceb76f
commit: 0579587ed3c87adbdbc6cf77daa7accc35871982 [32/61] KVM/x86: Remove superfluous SMP function call
config: x86_64-randconfig-r0-07120052 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        git checkout 0579587ed3c87adbdbc6cf77daa7accc35871982
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   arch/x86/kvm/x86.c: In function 'kvmclock_cpu_notifier':
>> arch/x86/kvm/x86.c:5665:15: warning: unused variable 'cpu' [-Wunused-variable]
     unsigned int cpu = (unsigned long)hcpu;
                  ^~~

vim +/cpu +5665 arch/x86/kvm/x86.c

c8076604 Gerd Hoffmann       2009-02-04  5649  		 * to kick the cpu out of guest context.  Next time
c8076604 Gerd Hoffmann       2009-02-04  5650  		 * guest context is entered kvmclock will be updated,
c8076604 Gerd Hoffmann       2009-02-04  5651  		 * so the guest will not see stale values.
c8076604 Gerd Hoffmann       2009-02-04  5652  		 */
8cfdc000 Zachary Amsden      2010-08-19  5653  		smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
c8076604 Gerd Hoffmann       2009-02-04  5654  	}
c8076604 Gerd Hoffmann       2009-02-04  5655  	return 0;
c8076604 Gerd Hoffmann       2009-02-04  5656  }
c8076604 Gerd Hoffmann       2009-02-04  5657  
c8076604 Gerd Hoffmann       2009-02-04  5658  static struct notifier_block kvmclock_cpufreq_notifier_block = {
c8076604 Gerd Hoffmann       2009-02-04  5659  	.notifier_call  = kvmclock_cpufreq_notifier
c8076604 Gerd Hoffmann       2009-02-04  5660  };
c8076604 Gerd Hoffmann       2009-02-04  5661  
8cfdc000 Zachary Amsden      2010-08-19  5662  static int kvmclock_cpu_notifier(struct notifier_block *nfb,
8cfdc000 Zachary Amsden      2010-08-19  5663  					unsigned long action, void *hcpu)
8cfdc000 Zachary Amsden      2010-08-19  5664  {
8cfdc000 Zachary Amsden      2010-08-19 @5665  	unsigned int cpu = (unsigned long)hcpu;
8cfdc000 Zachary Amsden      2010-08-19  5666  
8cfdc000 Zachary Amsden      2010-08-19  5667  	switch (action) {
8cfdc000 Zachary Amsden      2010-08-19  5668  		case CPU_ONLINE:
8cfdc000 Zachary Amsden      2010-08-19  5669  		case CPU_DOWN_FAILED:
0579587e Anna-Maria Gleixner 2016-07-11  5670  			tsc_khz_changed(NULL);
8cfdc000 Zachary Amsden      2010-08-19  5671  			break;
8cfdc000 Zachary Amsden      2010-08-19  5672  		case CPU_DOWN_PREPARE:
0579587e Anna-Maria Gleixner 2016-07-11  5673  			tsc_bad(NULL);

:::::: The code at line 5665 was first introduced by commit
:::::: 8cfdc0008542b57caadbfe013da163131a8293f4 KVM: x86: Make cpu_tsc_khz updates use local CPU

:::::: TO: Zachary Amsden <zamsden@...hat.com>
:::::: CC: Avi Kivity <avi@...hat.com>

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