kernel/sched/core.c:2709:20: warning: unused function 'rq_has_pinned_tasks'

From: kernel test robot
Date: Wed Apr 14 2021 - 19:26:23 EST


Hi Thomas,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 7f75285ca572eaabc028cf78c6ab5473d0d160be
commit: 3015ef4b98f53fe7eba4f5f82f562c0e074d213c sched/core: Make migrate disable and CPU hotplug cooperative
date: 5 months ago
config: mips-randconfig-r023-20210414 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45)
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=3015ef4b98f53fe7eba4f5f82f562c0e074d213c
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 3015ef4b98f53fe7eba4f5f82f562c0e074d213c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips

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

All warnings (new ones prefixed by >>):

kernel/sched/core.c:4984:35: warning: no previous prototype for function 'schedule_user'
asmlinkage __visible void __sched schedule_user(void)
^
kernel/sched/core.c:4984:22: note: declare 'static' if the function is not intended to be used outside of this translation unit
asmlinkage __visible void __sched schedule_user(void)
^
static
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:2704:20: warning: unused function 'is_migration_disabled'
static inline bool is_migration_disabled(struct task_struct
^
>> kernel/sched/core.c:2709:20: warning: unused function 'rq_has_pinned_tasks'
static inline bool rq_has_pinned_tasks(struct rq
^
kernel/sched/core.c:4496:20: warning: unused function 'sched_tick_start'
static inline void sched_tick_start(int cpu) { }
^
kernel/sched/core.c:4497:20: warning: unused function 'sched_tick_stop'
static inline void sched_tick_stop(int cpu) { }
^
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 6a18cc23efad410db48a3ccfc233d215de7d4cb9)
Target: mipsel-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-6a18cc23ef/bin
clang-13: note: diagnostic msg:
Makefile arch include kernel scripts source usr


vim +/rq_has_pinned_tasks +2709 kernel/sched/core.c

2708
> 2709 static inline bool rq_has_pinned_tasks(struct rq *rq)
2710 {
2711 return false;
2712 }
2713

---
0-DAY CI Kernel Test Service, Intel Corporation
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Attachment: .config.gz
Description: application/gzip