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Date:   Tue, 5 Oct 2021 10:46:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [ardb:arm-irq-stacks 15/15] arch/arm/kernel/irq.c:65:6: warning: no
 previous prototype for function 'do_softirq_own_stack'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm-irq-stacks
head:   4bbf7c9961e231d8e957583fc0f88e571748e304
commit: 4bbf7c9961e231d8e957583fc0f88e571748e304 [15/15] ARM: run softirqs on the per-CPU IRQ stack
config: arm-randconfig-r012-20211004 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dec2257f354d39dbd8232e6bd1a417d91c4f14a2)
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/ardb/linux.git/commit/?id=4bbf7c9961e231d8e957583fc0f88e571748e304
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb arm-irq-stacks
        git checkout 4bbf7c9961e231d8e957583fc0f88e571748e304
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

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 >>):

>> arch/arm/kernel/irq.c:65:6: warning: no previous prototype for function 'do_softirq_own_stack' [-Wmissing-prototypes]
   void do_softirq_own_stack(void)
        ^
   arch/arm/kernel/irq.c:65:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void do_softirq_own_stack(void)
   ^
   static 
   1 warning generated.


vim +/do_softirq_own_stack +65 arch/arm/kernel/irq.c

    64	
  > 65	void do_softirq_own_stack(void)
    66	{
    67		call_with_stack((void *)__do_softirq, NULL,
    68				__this_cpu_read(irq_stack_ptr));
    69	}
    70	

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

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