[tip:x86/timers 8/13] arch/x86/kernel/tsc_sync.c:34: warning: unused variable 'ref'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/timers
head:   cc4db26899dcd0e6ff0448c77abd8eb61b1a1333
commit: 8b223bc7abe0e30e8d297a24ee6c6c07ef8d0bb9 [8/13] x86/tsc: Store and check TSC ADJUST MSR
config: x86_64-randconfig-a0-11300349 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 8b223bc7abe0e30e8d297a24ee6c6c07ef8d0bb9
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   arch/x86/kernel/tsc_sync.c: In function 'tsc_store_and_check_tsc_adjust':
>> arch/x86/kernel/tsc_sync.c:34: warning: unused variable 'ref'

vim +/ref +34 arch/x86/kernel/tsc_sync.c

    18	#include <linux/spinlock.h>
    19	#include <linux/kernel.h>
    20	#include <linux/smp.h>
    21	#include <linux/nmi.h>
    22	#include <asm/tsc.h>
    23	
    24	struct tsc_adjust {
    25		s64	bootval;
    26		s64	adjusted;
    27	};
    28	
    29	static DEFINE_PER_CPU(struct tsc_adjust, tsc_adjust);
    30	
    31	#ifndef CONFIG_SMP
    32	void __init tsc_store_and_check_tsc_adjust(void)
    33	{
  > 34		struct tsc_adjust *ref, *cur = this_cpu_ptr(&tsc_adjust);
    35		s64 bootval;
    36	
    37		if (!boot_cpu_has(X86_FEATURE_TSC_ADJUST))
    38			return;
    39	
    40		rdmsrl(MSR_IA32_TSC_ADJUST, bootval);
    41		cur->bootval = bootval;
    42		cur->adjusted = bootval;

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