linux-kernel - [tip:x86/timers 10/13] arch/x86/include/asm/tsc.h:55:1: warning: no return statement in function returning non-void

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Date:   Wed, 30 Nov 2016 03:27:17 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Ingo Molnar <mingo@...nel.org>
Subject: [tip:x86/timers 10/13] arch/x86/include/asm/tsc.h:55:1: warning: no
 return statement in function returning non-void

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/timers
head:   950e7481b09cd3f426a9322b0f35139224660c0d
commit: ba75fb64693127c7b6e8a822c68d3480cbf56d6d [10/13] x86/tsc: Sync test only for the first cpu in a package
config: i386-randconfig-i0-201648 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
reproduce:
        git checkout ba75fb64693127c7b6e8a822c68d3480cbf56d6d
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/timex.h:5:0,
                    from include/linux/timex.h:65,
                    from include/linux/jiffies.h:8,
                    from include/linux/ktime.h:25,
                    from include/linux/rcupdate.h:47,
                    from include/linux/srcu.h:33,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:751,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:14,
                    from include/linux/crypto.h:24,
                    from arch/x86/kernel/asm-offsets.c:8:
   arch/x86/include/asm/tsc.h: In function 'tsc_store_and_check_tsc_adjust':
>> arch/x86/include/asm/tsc.h:55:1: warning: no return statement in function returning non-void [-Wreturn-type]
    static inline bool tsc_store_and_check_tsc_adjust(void) { }
    ^

vim +55 arch/x86/include/asm/tsc.h

    39	extern unsigned long native_calibrate_tsc(void);
    40	extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
    41	
    42	extern int tsc_clocksource_reliable;
    43	
    44	/*
    45	 * Boot-time check whether the TSCs are synchronized across
    46	 * all CPUs/cores:
    47	 */
    48	extern void check_tsc_sync_source(int cpu);
    49	extern void check_tsc_sync_target(void);
    50	
    51	#ifdef CONFIG_X86_TSC
    52	extern bool tsc_store_and_check_tsc_adjust(void);
    53	extern void tsc_verify_tsc_adjust(void);
    54	#else
  > 55	static inline bool tsc_store_and_check_tsc_adjust(void) { }
    56	static inline void tsc_verify_tsc_adjust(void) { }
    57	#endif
    58	
    59	extern int notsc_setup(char *);
    60	extern void tsc_save_sched_clock_state(void);
    61	extern void tsc_restore_sched_clock_state(void);
    62	
    63	unsigned long cpu_khz_from_msr(void);

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