tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/deprecated/android-4.4-p-release
head:   c159ade87311501e4e4b40eb2f35aa5607732957
commit: e5486e9c8991aa5b55959c96b6b375645b12dad6 [5601/9922] FROMLIST: tracing: Add support for preempt and irq enable/disable events
config: x86_64-rhel-8.3-kselftests
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/e5486e9c8991aa5b55959c96b6b375645b12dad6
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/deprecated/android-4.4-p-release
        git checkout e5486e9c8991aa5b55959c96b6b375645b12dad6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash LDFLAGS=-z max-page-size=0x200000  kernel/trace/

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/uaccess.h:4:0,
                    from kernel/trace/trace_irqsoff.c:13:
   include/linux/sched.h:1208:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
    const struct sched_group_energy * const(*sched_domain_energy_f)(int cpu);
    ^~~~~
   In file included from include/asm-generic/percpu.h:6:0,
                    from arch/x86/include/asm/percpu.h:551,
                    from arch/x86/include/asm/preempt.h:5,
                    from include/linux/preempt.h:59,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/sched.h:19,
                    from include/linux/uaccess.h:4,
                    from kernel/trace/trace_irqsoff.c:13:
>> kernel/trace/trace_irqsoff.c:772:28: warning: 'tracing_irq_cpu' defined but not used [-Wunused-variable]
    static DEFINE_PER_CPU(int, tracing_irq_cpu);
                               ^
   include/linux/percpu-defs.h:105:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION'
     __typeof__(type) name
                      ^~~~
   kernel/trace/trace_irqsoff.c:772:8: note: in expansion of macro 'DEFINE_PER_CPU'
    static DEFINE_PER_CPU(int, tracing_irq_cpu);
           ^~~~~~~~~~~~~~


vim +/tracing_irq_cpu +772 kernel/trace/trace_irqsoff.c

   770	
   771	/* Per-cpu variable to prevent redundant calls when IRQs already off */
 > 772	static DEFINE_PER_CPU(int, tracing_irq_cpu);
   773	

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