linux-kernel - kernel/trace/trace_osnoise.c:131:1: sparse: sparse: symbol '__pcpu_scope_per_cpu_timerlat_var' was not declared. Should it be static?

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Message-ID: <202207121205.3WDa90OI-lkp@intel.com>
Date:   Tue, 12 Jul 2022 12:38:44 +0800
From:   kernel test robot <lkp@...el.com>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: kernel/trace/trace_osnoise.c:131:1: sparse: sparse: symbol
 '__pcpu_scope_per_cpu_timerlat_var' was not declared. Should it be static?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5a29232d870d9e63fe5ff30b081be6ea7cc2465d
commit: a955d7eac1779b437ceb24fc352026a2cbcec140 trace: Add timerlat tracer
date:   1 year, 1 month ago
config: s390-randconfig-s032-20220712 (https://download.01.org/0day-ci/archive/20220712/202207121205.3WDa90OI-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a955d7eac1779b437ceb24fc352026a2cbcec140
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a955d7eac1779b437ceb24fc352026a2cbcec140
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
   kernel/trace/trace_osnoise.c:108:1: sparse: sparse: symbol '__pcpu_scope_per_cpu_osnoise_var' was not declared. Should it be static?
>> kernel/trace/trace_osnoise.c:131:1: sparse: sparse: symbol '__pcpu_scope_per_cpu_timerlat_var' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:223:14: sparse: sparse: symbol 'interface_lock' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:657:6: sparse: sparse: symbol 'osnoise_trace_irq_entry' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:680:6: sparse: sparse: symbol 'osnoise_trace_irq_exit' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:739:5: sparse: sparse: symbol 'hook_irq_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:771:6: sparse: sparse: symbol 'unhook_irq_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:788:6: sparse: sparse: symbol 'trace_softirq_entry_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:811:6: sparse: sparse: symbol 'trace_softirq_exit_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:953:1: sparse: sparse: symbol 'trace_sched_switch_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:971:5: sparse: sparse: symbol 'hook_thread_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:988:6: sparse: sparse: symbol 'unhook_thread_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:1000:6: sparse: sparse: symbol 'save_osn_sample_stats' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:1015:6: sparse: sparse: symbol 'diff_osn_sample_stats' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:1657:5: sparse: sparse: symbol 'timerlat_min_period' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:1658:5: sparse: sparse: symbol 'timerlat_max_period' was not declared. Should it be static?

vim +/__pcpu_scope_per_cpu_timerlat_var +131 kernel/trace/trace_osnoise.c

   112	
   113	/*
   114	 *  osnoise_unregister_instance - unregister a registered trace instance
   115	 *
   116	 * Remove the trace_array *tr from the list of instances running
   117	 * osnoise/timerlat tracers.
   118	 */
   119	static void osnoise_unregister_instance(struct trace_array *tr)
   120	{
   121		struct osnoise_instance *inst;
   122		int found = 0;
   123	
   124		/*
   125		 * register/unregister serialization is provided by trace's
   126		 * trace_types_lock.
   127		 */
   128		lockdep_assert_held(&trace_types_lock);
   129	
   130		list_for_each_entry_rcu(inst, &osnoise_instances, list) {
 > 131			if (inst->tr == tr) {
   132				list_del_rcu(&inst->list);
   133				found = 1;
   134				break;
   135			}
   136		}
   137	
   138		if (!found)
   139			return;
   140	
   141		kvfree_rcu(inst);
   142	}
   143	

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