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Subjectkernel/time/hrtimer.c:1830:20: warning: unused function '__hrtimer_peek_ahead_timers'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b5013d084e03e82ceeab4db8ae8ceeaebe76b0eb
commit: 81d741d3460ca422843ce0ec8351083f259c6166 hrtimer: Avoid unnecessary SMP function calls in clock_was_set()
date: 3 months ago
config: mips-randconfig-r031-20211014 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71)
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=81d741d3460ca422843ce0ec8351083f259c6166
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/xfs/ kernel/time/

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/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:276:20: warning: unused function 'is_migration_base'
static inline bool is_migration_base(struct hrtimer_clock_base
^
>> kernel/time/hrtimer.c:1830:20: warning: unused function '__hrtimer_peek_ahead_timers'
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 cefc01fa65a7ebcc10cbf3c3bb2278a6a122deaf)
Target: mipsel-unknown-linux
Thread model: posix
InstalledDir: /opt/cross/clang-cefc01fa65/bin
clang-14: note: diagnostic msg:
Makefile arch block drivers fs include kernel nr_bisected scripts source usr virt


vim +/__hrtimer_peek_ahead_timers +1830 kernel/time/hrtimer.c

82c5b7b527ccc4 kernel/hrtimer.c Ingo Molnar 2009-01-05 1829
82c5b7b527ccc4 kernel/hrtimer.c Ingo Molnar 2009-01-05 @1830 static inline void __hrtimer_peek_ahead_timers(void) { }
82c5b7b527ccc4 kernel/hrtimer.c Ingo Molnar 2009-01-05 1831

:::::: The code at line 1830 was first introduced by commit
:::::: 82c5b7b527ccc4b5d3cf832437e842f9d2920a79 hrtimer: splitout peek ahead functionality, fix

:::::: TO: Ingo Molnar <mingo@elte.hu>
:::::: CC: Ingo Molnar <mingo@elte.hu>

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