linux-kernel - drivers/irqchip/irq-bcm7038-l1.c:89:28: warning: unused function 'reg_mask

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Message-ID: <202112261532.AJEnMzCL-lkp@intel.com>
Date:   Sun, 26 Dec 2021 15:57:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: drivers/irqchip/irq-bcm7038-l1.c:89:28: warning: unused function
 'reg_mask_status'

Hi Paul,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   438645193e59e91761ccb3fa55f6ce70b615ff93
commit: c434b9f80b0923e6460031b0fd964f8b0bf3c6a6 MIPS: Kconfig: add MIPS_GENERIC_KERNEL symbol
date:   1 year, 3 months ago
config: mips-randconfig-c004-20211226 (https://download.01.org/0day-ci/archive/20211226/202112261532.AJEnMzCL-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 0c553cc1af2e4c14100df6cf4a6fc91987e778e6)
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=c434b9f80b0923e6460031b0fd964f8b0bf3c6a6
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c434b9f80b0923e6460031b0fd964f8b0bf3c6a6
        # save the config file 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 block/ drivers/irqchip/ drivers/scsi/ufs/ 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 >>):

>> drivers/irqchip/irq-bcm7038-l1.c:89:28: warning: unused function 'reg_mask_status'
   static inline unsigned int reg_mask_status(struct bcm7038_l1_chip
   ^
   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 = 133, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $1
   and $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 0c553cc1af2e4c14100df6cf4a6fc91987e778e6)
   Target: mips-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-0c553cc1af/bin
   clang-14: note: diagnostic msg:
   Makefile arch block drivers include kernel mm nr_bisected scripts sound source usr
--
   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:1487:7: warning: variable 'expires_in_hardirq' set but not used
   bool expires_in_hardirq;
   ^
   kernel/time/hrtimer.c:147:20: warning: unused function 'is_migration_base'
   static inline bool is_migration_base(struct hrtimer_clock_base
   ^
>> kernel/time/hrtimer.c:621:19: warning: unused function 'hrtimer_hres_active'
   static inline int hrtimer_hres_active(void)
   ^
   kernel/time/hrtimer.c:1726:20: 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: '.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/barrier.h", .line = 21, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
   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 0c553cc1af2e4c14100df6cf4a6fc91987e778e6)
   Target: mips-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-0c553cc1af/bin
   clang-14: note: diagnostic msg:
   Makefile arch block drivers include kernel mm nr_bisected scripts sound source usr


vim +/reg_mask_status +89 drivers/irqchip/irq-bcm7038-l1.c

5f7f0317ed28b8 Kevin Cernekee 2014-12-25  88  
5f7f0317ed28b8 Kevin Cernekee 2014-12-25 @89  static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
5f7f0317ed28b8 Kevin Cernekee 2014-12-25  90  					   unsigned int word)
5f7f0317ed28b8 Kevin Cernekee 2014-12-25  91  {
5f7f0317ed28b8 Kevin Cernekee 2014-12-25  92  	return (1 * intc->n_words + word) * sizeof(u32);
5f7f0317ed28b8 Kevin Cernekee 2014-12-25  93  }
5f7f0317ed28b8 Kevin Cernekee 2014-12-25  94  

:::::: The code at line 89 was first introduced by commit
:::::: 5f7f0317ed28b86bdae9baf65bb72d405b6f79ee IRQCHIP: Add new driver for BCM7038-style level 1 interrupt controllers

:::::: TO: Kevin Cernekee <cernekee@...il.com>
:::::: CC: Ralf Baechle <ralf@...ux-mips.org>

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