[kbuild-all] kernel/time/hrtimer.c:276:20: warning: unused function 'is_migration_base'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 923dcc5eb0c111eccd51cc7ce1658537e3c38b25 commit: 81d741d3460ca422843ce0ec8351083f259c6166 hrtimer: Avoid unnecessary SMP function calls in clock_was_set() date: 3 months ago config: mips-randconfig-c004-20211119 (attached as .config) 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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 81d741d3460ca422843ce0ec8351083f259c6166 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash fs/ kernel/time/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/time/hrtimer.c:120:21: warning: initializer overrides prior initialization of this subobject = HRTIMER_BASE_REALTIME, ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:118:27: note: previous initialization is here [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES, ^~~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:121:22: warning: initializer overrides prior initialization of this subobject = HRTIMER_BASE_MONOTONIC, ^~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:118:27: note: previous initialization is here [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES, ^~~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:122:21: warning: initializer overrides prior initialization of this subobject = HRTIMER_BASE_BOOTTIME, ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:118:27: note: previous initialization is here [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES, ^~~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:123:17: warning: initializer overrides prior initialization of this subobject = HRTIMER_BASE_TAI, ^~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:118:27: note: previous initialization is here [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES, ^~~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:1591:7: warning: variable 'expires_in_hardirq' set but not used bool expires_in_hardirq; ^ static inline bool is_migration_base(struct hrtimer_clock_base ^ static inline void __hrtimer_peek_ahead_timers(void) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 or $0, $2 sc $0, $1 beqz $0, 1b .set pop ' 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 fefe20b99313d6b0738806d1504652c3b7edb9e0) Target: mipsel-unknown-linux Thread model: posix InstalledDir: /opt/cross/clang-fefe20b993/bin clang-14: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm net scripts security sound source usr virt vim +/is_migration_base +276 kernel/time/hrtimer.c c0a3132963db68 kernel/hrtimer.c Thomas Gleixner 2006-01-09 275 5d2295f3a93b04 kernel/time/hrtimer.c Sebastian Andrzej Siewior 2019-09-04 @276 static inline bool is_migration_base(struct hrtimer_clock_base *base) 5d2295f3a93b04 kernel/time/hrtimer.c Sebastian Andrzej Siewior 2019-09-04 277 { 5d2295f3a93b04 kernel/time/hrtimer.c Sebastian Andrzej Siewior 2019-09-04 278 return false; 5d2295f3a93b04 kernel/time/hrtimer.c Sebastian Andrzej Siewior 2019-09-04 279 } 5d2295f3a93b04 kernel/time/hrtimer.c Sebastian Andrzej Siewior 2019-09-04 280 :::::: The code at line 276 was first introduced by commit :::::: 5d2295f3a93b04986d069ebeaf5b07725f9096c1 hrtimer: Add a missing bracket and hide `migration_base' on !SMP :::::: TO: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org