linux-kernel - kernel/time/hrtimer.c:650:19: warning: unused function 'hrtimer_hres

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Message-ID: <202109051831.N7dAR8MO-lkp@intel.com>
Date:   Sun, 5 Sep 2021 18:02:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: kernel/time/hrtimer.c:650:19: warning: unused function
 'hrtimer_hres_active'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   49624efa65ac9889f4e7c7b2452b2e6ce42ba37d
commit: 9482fd71dbb8f0d1a61821a83e467dc0a9d7b429 hrtimer: Use raw_cpu_ptr() in clock_was_set()
date:   3 weeks ago
config: mips-randconfig-r003-20210904 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1104e3258b5064e7110cc297e2cec60ac9acfc0a)
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=9482fd71dbb8f0d1a61821a83e467dc0a9d7b429
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 9482fd71dbb8f0d1a61821a83e467dc0a9d7b429
        # 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/time/

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/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:650:19: warning: unused function 'hrtimer_hres_active'
   static inline int hrtimer_hres_active(void)
   ^
   kernel/time/hrtimer.c:1887:20: 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 6fe2beba7d2a41964af658c8c59dd172683ef739)
   Target: mips-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-6fe2beba7d/bin
   clang-14: note: diagnostic msg:
   Makefile arch drivers include kernel net scripts security sound source usr


vim +/hrtimer_hres_active +650 kernel/time/hrtimer.c

28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21  649  
28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21 @650  static inline int hrtimer_hres_active(void)
28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21  651  {
28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21  652  	return __hrtimer_hres_active(this_cpu_ptr(&hrtimer_bases));
28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21  653  }
28bfd18bf3daa5 Anna-Maria Gleixner 2017-12-21  654  

:::::: The code at line 650 was first introduced by commit
:::::: 28bfd18bf3daa5db8bb3422ea7138c8b7d2444ac hrtimer: Make the hrtimer_cpu_base::hres_active field unconditional, to simplify the code

:::::: TO: Anna-Maria Gleixner <anna-maria@...utronix.de>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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

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