linux-kernel - arch/arm/mach-iop32x/cp6.c:10:6: warning: no previous prototype for function 'iop_enable

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Date:   Thu, 31 Mar 2022 05:41:41 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>
Subject: arch/arm/mach-iop32x/cp6.c:10:6: warning: no previous prototype for
 function 'iop_enable_cp6'

Hi Arnd,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d888c83fcec75194a8a48ccd283953bdba7b2550
commit: 6f5d248d05db9c4991366154f1a657a630faa583 ARM: iop32x: use GENERIC_IRQ_MULTI_HANDLER
date:   4 months ago
config: arm-randconfig-r024-20220330 (https://download.01.org/0day-ci/archive/20220331/202203310512.uBfXEXYW-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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=6f5d248d05db9c4991366154f1a657a630faa583
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6f5d248d05db9c4991366154f1a657a630faa583
        # 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

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/mach-iop32x/cp6.c:10:6: warning: no previous prototype for function 'iop_enable_cp6' [-Wmissing-prototypes]
   void iop_enable_cp6(void)
        ^
   arch/arm/mach-iop32x/cp6.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void iop_enable_cp6(void)
   ^
   static 
   arch/arm/mach-iop32x/cp6.c:43:13: warning: no previous prototype for function 'iop_init_cp6_handler' [-Wmissing-prototypes]
   void __init iop_init_cp6_handler(void)
               ^
   arch/arm/mach-iop32x/cp6.c:43:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init iop_init_cp6_handler(void)
   ^
   static 
   2 warnings generated.


vim +/iop_enable_cp6 +10 arch/arm/mach-iop32x/cp6.c

     9	
  > 10	void iop_enable_cp6(void)
    11	{
    12		u32 temp;
    13	
    14	        /* enable cp6 access */
    15	        asm volatile (
    16			"mrc	p15, 0, %0, c15, c1, 0\n\t"
    17			"orr	%0, %0, #(1 << 6)\n\t"
    18			"mcr	p15, 0, %0, c15, c1, 0\n\t"
    19			"mrc	p15, 0, %0, c15, c1, 0\n\t"
    20			"mov	%0, %0\n\t"
    21			"sub	pc, pc, #4  @ cp_wait\n\t"
    22			: "=r"(temp));
    23	}
    24	

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