linux-kernel - kernel/time/hrtimer.c:276:20: warning: unused function 'is_migration

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Date:   Sun, 21 Nov 2021 15:13:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: 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/?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/ 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:1591:7: warning: variable 'expires_in_hardirq' set but not used
   bool expires_in_hardirq;
   ^
>> 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:1816:20: 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 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@...utronix.de>
:::::: CC: Thomas Gleixner <tglx@...utronix.de>

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

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