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Date:   Sat, 6 Aug 2022 22:39:24 +0800
From:   kernel test robot <lkp@intel.com>
To:     Huacai Chen <chenhuacai@loongson.cn>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
        Jianmin Lv <lvjianmin@loongson.cn>
Subject: drivers/irqchip/irq-loongson-pch-pic.c:51:5: warning: no previous
 prototype for function 'find_pch_pic'
Message-ID: <202208062228.5NkhxzNQ-lkp@intel.com>
MIME-Version: 1.0
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6614a3c3164a5df2b54abb0b3559f51041cf705b
commit: bcdd75c596c89d7925a3438fde2578ca23a62b06 irqchip/loongson-pch-pic: Add ACPI init support
date:   2 weeks ago
config: mips-loongson2k_defconfig (https://download.01.org/0day-ci/archive/20220806/202208062228.5NkhxzNQ-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 26dd42705c2af0b8f6e5d6cdb32c9bd5ed9524eb)
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-mips64el-linux-gnuabi64
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bcdd75c596c89d7925a3438fde2578ca23a62b06
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout bcdd75c596c89d7925a3438fde2578ca23a62b06
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/irqchip/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/irqchip/irq-loongson-pch-pic.c:51:5: warning: no previous prototype for function 'find_pch_pic' [-Wmissing-prototypes]
   int find_pch_pic(u32 gsi)
       ^
   drivers/irqchip/irq-loongson-pch-pic.c:51:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int find_pch_pic(u32 gsi)
   ^
   static 
   1 warning generated.


vim +/find_pch_pic +51 drivers/irqchip/irq-loongson-pch-pic.c

    50	
  > 51	int find_pch_pic(u32 gsi)
    52	{
    53		int i;
    54	
    55		/* Find the PCH_PIC that manages this GSI. */
    56		for (i = 0; i < MAX_IO_PICS; i++) {
    57			struct pch_pic *priv = pch_pic_priv[i];
    58	
    59			if (!priv)
    60				return -1;
    61	
    62			if (gsi >= priv->gsi_base && gsi < (priv->gsi_base + priv->vec_count))
    63				return i;
    64		}
    65	
    66		pr_err("ERROR: Unable to locate PCH_PIC for GSI %d\n", gsi);
    67		return -1;
    68	}
    69	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp