linux-kernel - [tip:x86/timers 8/13] arch/x86/kernel/tsc_sync.c:43:43: error: 'cpu' undeclared

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Date:   Wed, 30 Nov 2016 02:20:32 +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 8/13] arch/x86/kernel/tsc_sync.c:43:43: error: 'cpu'
 undeclared

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/timers
head:   950e7481b09cd3f426a9322b0f35139224660c0d
commit: 9ad337981a09fb5e53884f6614eb277e1f782460 [8/13] x86/tsc: Store and check TSC ADJUST MSR
config: i386-alldefconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 9ad337981a09fb5e53884f6614eb277e1f782460
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:13:0,
                    from include/linux/cpumask.h:9,
                    from include/linux/topology.h:30,
                    from arch/x86/kernel/tsc_sync.c:17:
   arch/x86/kernel/tsc_sync.c: In function 'tsc_store_and_check_tsc_adjust':
>> arch/x86/kernel/tsc_sync.c:43:43: error: 'cpu' undeclared (first use in this function)
     pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
                                              ^
   include/linux/printk.h:284:34: note: in definition of macro 'pr_info'
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
                                     ^~~~~~~~~~~
   arch/x86/kernel/tsc_sync.c:43:43: note: each undeclared identifier is reported only once for each function it appears in
     pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
                                              ^
   include/linux/printk.h:284:34: note: in definition of macro 'pr_info'
     printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
                                     ^~~~~~~~~~~
   arch/x86/kernel/tsc_sync.c:34:21: warning: unused variable 'ref' [-Wunused-variable]
     struct tsc_adjust *ref, *cur = this_cpu_ptr(&tsc_adjust);
                        ^~~

vim +/cpu +43 arch/x86/kernel/tsc_sync.c

    11	 * CPU is the 'target CPU'.
    12	 *
    13	 * Only two CPUs may participate - they can enter in any order.
    14	 * ( The serial nature of the boot logic and the CPU hotplug lock
    15	 *   protects against more than 2 CPUs entering this code. )
    16	 */
  > 17	#include <linux/topology.h>
    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;
  > 43		pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
    44	}
    45	
    46	#else /* !CONFIG_SMP */

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