[linux-next:master 4808/7265] arch/arm/mach-omap1/timer32k.c:215:12: warning: no previous prototype for function 'omap_init_clocksource_32k'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f02ac5c95dfd45d2f50ecc68d79177de326c668c
commit: d379e8899a8da1041c347ae5b792773c48a559a9 [4808/7265] ARM: omap1: move 32k counter from plat-omap to mach-omap1
config: arm-omap1_defconfig (https://download.01.org/0day-ci/archive/20220428/202204280347.ar7Y3m5k-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 1cddcfdc3c683b393df1a5c9063252eb60e52818)
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/next/linux-next.git/commit/?id=d379e8899a8da1041c347ae5b792773c48a559a9
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout d379e8899a8da1041c347ae5b792773c48a559a9
        # 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=arm SHELL=/bin/bash

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/mach-omap1/timer32k.c:215:12: warning: no previous prototype for function 'omap_init_clocksource_32k' [-Wmissing-prototypes]
   int __init omap_init_clocksource_32k(void __iomem *vbase)
              ^
   arch/arm/mach-omap1/timer32k.c:215:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __init omap_init_clocksource_32k(void __iomem *vbase)
   ^
   static 
   1 warning generated.


vim +/omap_init_clocksource_32k +215 arch/arm/mach-omap1/timer32k.c

   205	
   206	/**
   207	 * omap_init_clocksource_32k - setup and register counter 32k as a
   208	 * kernel clocksource
   209	 * @pbase: base addr of counter_32k module
   210	 * @size: size of counter_32k to map
   211	 *
   212	 * Returns 0 upon success or negative error code upon failure.
   213	 *
   214	 */
 > 215	int __init omap_init_clocksource_32k(void __iomem *vbase)
   216	{
   217		int ret;
   218	
   219		/*
   220		 * 32k sync Counter IP register offsets vary between the
   221		 * highlander version and the legacy ones.
   222		 * The 'SCHEME' bits(30-31) of the revision register is used
   223		 * to identify the version.
   224		 */
   225		if (readl_relaxed(vbase + OMAP2_32KSYNCNT_REV_OFF) &
   226							OMAP2_32KSYNCNT_REV_SCHEME)
   227			sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_HIGH;
   228		else
   229			sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_LOW;
   230	
   231		/*
   232		 * 120000 rough estimate from the calculations in
   233		 * __clocksource_update_freq_scale.
   234		 */
   235		clocks_calc_mult_shift(&persistent_mult, &persistent_shift,
   236				32768, NSEC_PER_SEC, 120000);
   237	
   238		ret = clocksource_mmio_init(sync32k_cnt_reg, "32k_counter", 32768,
   239					250, 32, clocksource_mmio_readl_up);
   240		if (ret) {
   241			pr_err("32k_counter: can't register clocksource\n");
   242			return ret;
   243		}
   244	
   245		sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
   246		register_persistent_clock(omap_read_persistent_clock64);
   247		pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
   248	
   249		return 0;
   250	}
   251	

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