linux-kernel - [linux-rt-devel:linux-5.13.y-rt-testing 205/226] kernel/sched/core.c:5459:19: warning: unused function 'preemptible

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Date:   Sat, 10 Jul 2021 23:39:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [linux-rt-devel:linux-5.13.y-rt-testing 205/226]
 kernel/sched/core.c:5459:19: warning: unused function 'preemptible_lazy'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.13.y-rt-testing
head:   2eb9270f1294b849cb310d6fb1f2675dfb3f9c75
commit: 2d1c3636a727647cffb1185ccac6897e551a4071 [205/226] sched: Add support for lazy preemption
config: mips-randconfig-r032-20210709 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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=2d1c3636a727647cffb1185ccac6897e551a4071
        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-5.13.y-rt-testing
        git checkout 2d1c3636a727647cffb1185ccac6897e551a4071
        # 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:2964:13: warning: variable 'rq' set but not used
   struct rq
   ^
   kernel/sched/core.c:2954:20: warning: unused function 'rq_has_pinned_tasks'
   static inline bool rq_has_pinned_tasks(struct rq
   ^
   kernel/sched/core.c:4858:20: warning: unused function 'sched_tick_start'
   static inline void sched_tick_start(int cpu) { }
   ^
   kernel/sched/core.c:4859:20: warning: unused function 'sched_tick_stop'
   static inline void sched_tick_stop(int cpu) { }
   ^
>> kernel/sched/core.c:5459:19: 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-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 13.0.0 (git://gitmirror/llvm_project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-8d69635ed9/bin
   clang-13: note: diagnostic msg:
   Makefile arch block certs crypto drivers fs include init ipc kernel lib mm samples scripts security sound source usr virt


vim +/preemptible_lazy +5459 kernel/sched/core.c

  5458	
> 5459	static inline int preemptible_lazy(void)
  5460	{
  5461		return 1;
  5462	}
  5463	

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

Download attachment ".config.gz" of type "application/gzip" (24635 bytes)