Date:   Thu, 9 Dec 2021 23:22:48 +0800
From:   kernel test robot <lkp@intel.com>
To:     Ard Biesheuvel <ardb@kernel.org>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org,
        Russell King <rmk+kernel@armlinux.org.uk>,
        Linus Walleij <linus.walleij@linaro.org>
Subject: arch/arm/kernel/traps.c:775:6: warning: no previous prototype for
 function 'abort'
Message-ID: <202112092330.MRS9Xygy-lkp@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk

Hi Ard,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2a987e65025e2b79c6d453b78cb5985ac6e5eb26
commit: 4d576cab16f57e1f87978f6997a725179398341e ARM: 9028/1: disable KASAN in call stack capturing routines
date:   1 year ago
config: arm-randconfig-c002-20211209 (https://download.01.org/0day-ci/archive/20211209/202112092330.MRS9Xygy-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4d576cab16f57e1f87978f6997a725179398341e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4d576cab16f57e1f87978f6997a725179398341e
        # 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=arm SHELL=/bin/bash arch/arm/kernel/ drivers/media/platform/

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 >>):

   arch/arm/kernel/traps.c:82:6: warning: no previous prototype for function 'dump_backtrace_stm' [-Wmissing-prototypes]
   void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl)
        ^
   arch/arm/kernel/traps.c:82:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl)
   ^
   static 
   arch/arm/kernel/traps.c:445:17: warning: no previous prototype for function 'do_undefinstr' [-Wmissing-prototypes]
   asmlinkage void do_undefinstr(struct pt_regs *regs)
                   ^
   arch/arm/kernel/traps.c:445:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void do_undefinstr(struct pt_regs *regs)
              ^
              static 
   arch/arm/kernel/traps.c:510:39: warning: no previous prototype for function 'handle_fiq_as_nmi' [-Wmissing-prototypes]
   asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs)
                                         ^
   arch/arm/kernel/traps.c:510:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs)
              ^
              static 
   arch/arm/kernel/traps.c:529:17: warning: no previous prototype for function 'bad_mode' [-Wmissing-prototypes]
   asmlinkage void bad_mode(struct pt_regs *regs, int reason)
                   ^
   arch/arm/kernel/traps.c:529:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void bad_mode(struct pt_regs *regs, int reason)
              ^
              static 
   arch/arm/kernel/traps.c:602:16: warning: no previous prototype for function 'arm_syscall' [-Wmissing-prototypes]
   asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                  ^
   arch/arm/kernel/traps.c:602:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage int arm_syscall(int no, struct pt_regs *regs)
              ^
              static 
   arch/arm/kernel/traps.c:728:1: warning: no previous prototype for function 'baddataabort' [-Wmissing-prototypes]
   baddataabort(int code, unsigned long instr, struct pt_regs *regs)
   ^
   arch/arm/kernel/traps.c:727:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void
              ^
              static 
   arch/arm/kernel/traps.c:768:17: warning: no previous prototype for function '__div0' [-Wmissing-prototypes]
   asmlinkage void __div0(void)
                   ^
   arch/arm/kernel/traps.c:768:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void __div0(void)
              ^
              static 
>> arch/arm/kernel/traps.c:775:6: warning: no previous prototype for function 'abort' [-Wmissing-prototypes]
   void abort(void)
        ^
   arch/arm/kernel/traps.c:775:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void abort(void)
   ^
   static 
   arch/arm/kernel/traps.c:783:13: warning: no previous prototype for function 'trap_init' [-Wmissing-prototypes]
   void __init trap_init(void)
               ^
   arch/arm/kernel/traps.c:783:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init trap_init(void)
   ^
   static 
   9 warnings generated.


vim +/abort +775 arch/arm/kernel/traps.c

^1da177e4c3f41 Linus Torvalds 2005-04-16  767  
^1da177e4c3f41 Linus Torvalds 2005-04-16 @768  asmlinkage void __div0(void)
^1da177e4c3f41 Linus Torvalds 2005-04-16  769  {
4ed89f22280614 Russell King   2014-10-28  770  	pr_err("Division by zero in kernel.\n");
^1da177e4c3f41 Linus Torvalds 2005-04-16  771  	dump_stack();
^1da177e4c3f41 Linus Torvalds 2005-04-16  772  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  773  EXPORT_SYMBOL(__div0);
^1da177e4c3f41 Linus Torvalds 2005-04-16  774  
^1da177e4c3f41 Linus Torvalds 2005-04-16 @775  void abort(void)
^1da177e4c3f41 Linus Torvalds 2005-04-16  776  {
^1da177e4c3f41 Linus Torvalds 2005-04-16  777  	BUG();
^1da177e4c3f41 Linus Torvalds 2005-04-16  778  
^1da177e4c3f41 Linus Torvalds 2005-04-16  779  	/* if that doesn't kill us, halt */
^1da177e4c3f41 Linus Torvalds 2005-04-16  780  	panic("Oops failed to kill thread");
^1da177e4c3f41 Linus Torvalds 2005-04-16  781  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  782  

:::::: The code at line 775 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
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