linux-kernel - kernel/trace/trace_osnoise.c:101:1: sparse: sparse: symbol '__pcpu_scope_per_cpu_osnoise_var' was not declared. Should it be static?

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Date:   Wed, 27 Apr 2022 01:55:08 +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:101:1: sparse: sparse: symbol
 '__pcpu_scope_per_cpu_osnoise_var' was not declared. Should it be static?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d615b5416f8a1afeb82d13b238f8152c572d59c0
commit: bce29ac9ce0bb0b0b146b687ab978378c21e9078 trace: Add osnoise tracer
date:   10 months ago
config: parisc-randconfig-s031-20220425 (https://download.01.org/0day-ci/archive/20220427/202204270146.IRxXM4hU-lkp@intel.com/config)
compiler: hppa-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-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bce29ac9ce0bb0b0b146b687ab978378c21e9078
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout bce29ac9ce0bb0b0b146b687ab978378c21e9078
        # 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=parisc SHELL=/bin/bash

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


sparse warnings: (new ones prefixed by >>)
>> kernel/trace/trace_osnoise.c:101:1: sparse: sparse: symbol '__pcpu_scope_per_cpu_osnoise_var' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:160:14: sparse: sparse: symbol 'interface_lock' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:438:6: sparse: sparse: symbol 'osnoise_trace_irq_entry' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:461:6: sparse: sparse: symbol 'osnoise_trace_irq_exit' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:520:5: sparse: sparse: symbol 'hook_irq_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:552:6: sparse: sparse: symbol 'unhook_irq_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:569:6: sparse: sparse: symbol 'trace_softirq_entry_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:592:6: sparse: sparse: symbol 'trace_softirq_exit_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:706:1: sparse: sparse: symbol 'trace_sched_switch_callback' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:724:5: sparse: sparse: symbol 'hook_thread_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:741:6: sparse: sparse: symbol 'unhook_thread_events' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:753:6: sparse: sparse: symbol 'save_osn_sample_stats' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:768:6: sparse: sparse: symbol 'diff_osn_sample_stats' was not declared. Should it be static?
   kernel/trace/trace_osnoise.c:966:17: sparse: sparse: incompatible types in comparison expression (different signedness):
   kernel/trace/trace_osnoise.c:966:17: sparse:    signed long long *
   kernel/trace/trace_osnoise.c:966:17: sparse:    unsigned long long [usertype] *

vim +/__pcpu_scope_per_cpu_osnoise_var +101 kernel/trace/trace_osnoise.c

    85	
    86	/*
    87	 * osnoise_register_instance - register a new trace instance
    88	 *
    89	 * Register a trace_array *tr in the list of instances running
    90	 * osnoise/timerlat tracers.
    91	 */
    92	static int osnoise_register_instance(struct trace_array *tr)
    93	{
    94		struct osnoise_instance *inst;
    95	
    96		/*
    97		 * register/unregister serialization is provided by trace's
    98		 * trace_types_lock.
    99		 */
   100		lockdep_assert_held(&trace_types_lock);
 > 101	
   102		inst = kmalloc(sizeof(*inst), GFP_KERNEL);
   103		if (!inst)
   104			return -ENOMEM;
   105	
   106		INIT_LIST_HEAD_RCU(&inst->list);
   107		inst->tr = tr;
   108		list_add_tail_rcu(&inst->list, &osnoise_instances);
   109	
   110		return 0;
   111	}
   112	

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