Messages in this thread | | | Date | Mon, 11 Oct 2021 14:48:01 +0800 | From | kernel test robot <> | Subject | kernel/sched/core.c:6854:20: warning: unused function 'balance_hotplug_wait' |
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Hi Thomas,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc commit: 1cf12e08bc4d50a76b80c42a3109c53d8794a0c9 sched/hotplug: Consolidate task migration on CPU unplug date: 11 months ago config: mips-randconfig-r012-20211011 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 903b30fea21f99d8f48fde4defcc838970e30ee1) 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/torvalds/linux.git/commit/?id=1cf12e08bc4d50a76b80c42a3109c53d8794a0c9 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 1cf12e08bc4d50a76b80c42a3109c53d8794a0c9 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash kernel/sched/
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
kernel/sched/core.c:2376:6: warning: no previous prototype for function 'sched_set_stop_task' void sched_set_stop_task(int cpu, struct task_struct ^ kernel/sched/core.c:2376:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void sched_set_stop_task(int cpu, struct task_struct ^ static kernel/sched/core.c:3746:13: warning: variable 'rq' set but not used struct rq ^ kernel/sched/core.c:324:1: warning: unused function 'rq_csd_init' rq_csd_init(struct rq call_single_data_t smp_call_func_t func) ^ kernel/sched/core.c:4196:20: warning: unused function 'sched_tick_stop' static inline void sched_tick_stop(int cpu) { } ^ >> kernel/sched/core.c:6854:20: warning: unused function 'balance_hotplug_wait' static inline void balance_hotplug_wait(void) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set noat .set push .set arch=r4000 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( 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 f95d9c95bbf4cf662b9a181245fc6dcede39f590) Target: mipsel-unknown-linux Thread model: posix InstalledDir: /opt/cross/clang-f95d9c95bb/bin clang-14: note: diagnostic msg: Makefile arch include kernel scripts source usr
vim +/balance_hotplug_wait +6854 kernel/sched/core.c
2558aacff8586699 Peter Zijlstra 2020-09-11 6853 f2469a1fb43f85d2 Thomas Gleixner 2020-09-14 @6854 static inline void balance_hotplug_wait(void) f2469a1fb43f85d2 Thomas Gleixner 2020-09-14 6855 { f2469a1fb43f85d2 Thomas Gleixner 2020-09-14 6856 } f2469a1fb43f85d2 Thomas Gleixner 2020-09-14 6857
:::::: The code at line 6854 was first introduced by commit :::::: f2469a1fb43f85d243ce72638367fb6e15c33491 sched/core: Wait for tasks being pushed away on hotplug
:::::: TO: Thomas Gleixner <tglx@linutronix.de> :::::: CC: Peter Zijlstra <peterz@infradead.org>
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