[linux-rt-devel:linux-5.10.y-rt-rebase 165/194] kernel/sched/core.c:5320:19: warning: unused function 'preemptible_lazy'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.10.y-rt-rebase
head:   16966f1ba0ebb5c8032e87e7e6d46f1bfd38c780
commit: d414e1e3d51bf67ed765419477b3545e9d54b01b [165/194] sched: Add support for lazy preemption
config: mips-randconfig-r023-20201028 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 772aaa602383cf82795572ebcd86b0e660f3579f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=d414e1e3d51bf67ed765419477b3545e9d54b01b
        git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags linux-rt-devel linux-5.10.y-rt-rebase
        git checkout d414e1e3d51bf67ed765419477b3545e9d54b01b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

   kernel/sched/core.c:2883:6: warning: no previous prototype for function 'sched_set_stop_task'
   void sched_set_stop_task(int cpu, struct task_struct
   ^
   kernel/sched/core.c:2883:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void sched_set_stop_task(int cpu, struct task_struct
   ^
   static
>> kernel/sched/core.c:5320:19: warning: unused function 'preemptible_lazy'
   static inline int preemptible_lazy(void)
   ^
   fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 21, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
   clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 12.0.0 (git://gitmirror/llvm_project 772aaa602383cf82795572ebcd86b0e660f3579f)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-772aaa6023/bin
   clang-12: note: diagnostic msg:
   Makefile arch include kernel scripts source usr

vim +/preemptible_lazy +5320 kernel/sched/core.c

  5319	
> 5320	static inline int preemptible_lazy(void)
  5321	{
  5322		return 1;
  5323	}
  5324	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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