linux-kernel - [linux-rt-devel:linux-5.14.y-rt-rebase 245/263] kernel/sched/core.c:6336:19: warning: unused function 'preemptible

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Date:   Thu, 9 Sep 2021 18:57:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [linux-rt-devel:linux-5.14.y-rt-rebase 245/263]
 kernel/sched/core.c:6336:19: warning: unused function 'preemptible_lazy'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.14.y-rt-rebase
head:   a1ea175d809fdb71148c7f6ff7f3f59b9b47b257
commit: 7ac22c0eae125aba94455aae5ac98daf623d4174 [245/263] sched: Add support for lazy preemption
config: mips-randconfig-r004-20210908 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
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=7ac22c0eae125aba94455aae5ac98daf623d4174
        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-5.14.y-rt-rebase
        git checkout 7ac22c0eae125aba94455aae5ac98daf623d4174
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=mips SHELL=/bin/bash kernel/sched/

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

All warnings (new ones prefixed by >>):

   kernel/sched/core.c:3320:20: warning: unused function 'rq_has_pinned_tasks'
   static inline bool rq_has_pinned_tasks(struct rq
   ^
   kernel/sched/core.c:5214:20: warning: unused function 'sched_tick_start'
   static inline void sched_tick_start(int cpu) { }
   ^
   kernel/sched/core.c:5215:20: warning: unused function 'sched_tick_stop'
   static inline void sched_tick_stop(int cpu) { }
   ^
   kernel/sched/core.c:5944:20: warning: unused function 'sched_core_cpu_starting'
   static inline void sched_core_cpu_starting(unsigned int cpu) {}
   ^
   kernel/sched/core.c:5945:20: warning: unused function 'sched_core_cpu_deactivate'
   static inline void sched_core_cpu_deactivate(unsigned int cpu) {}
   ^
   kernel/sched/core.c:5946:20: warning: unused function 'sched_core_cpu_dying'
   static inline void sched_core_cpu_dying(unsigned int cpu) {}
   ^
>> kernel/sched/core.c:6336:19: warning: unused function 'preemptible_lazy'
   static inline int preemptible_lazy(void)
   ^
   fatal error: error in backend: Nested variants found in inline asm string: ' .set push
   .set noat
   .set push
   .set arch=r4000
   .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/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $2 # __cmpxchg_asm
   bne $0, ${3:z}, 2f
   .set pop
   move $$1, ${4:z}
   .set arch=r4000
   sc $$1, $1
   beqz $$1, 1b
   .set pop
   2: .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/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   '
   clang-14: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 14.0.0 (git://gitmirror/llvm_project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
   Target: mipsel-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-261cbe98c3/bin
   clang-14: note: diagnostic msg:
   Makefile arch include kernel nr_bisected scripts source usr


vim +/preemptible_lazy +6336 kernel/sched/core.c

  6335	
> 6336	static inline int preemptible_lazy(void)
  6337	{
  6338		return 1;
  6339	}
  6340	

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

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