[linux-next:master 8612/10875] arch/arm/mach-imx/src.c:103:6: warning: no previous prototype for 'imx_gpcv2_set_core1_pdn_pup_by_software'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   7d9c6b8147bdd76d7eb2cf6f74f84c6918ae0939
commit: e34645f45805d8308866de7b69f117f554605bb6 [8612/10875] ARM: imx: add smp support for imx7d
config: arm-randconfig-r011-20210617 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e34645f45805d8308866de7b69f117f554605bb6
        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 e34645f45805d8308866de7b69f117f554605bb6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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-imx/src.c:103:6: warning: no previous prototype for 'imx_gpcv2_set_core1_pdn_pup_by_software' [-Wmissing-prototypes]
     103 | void imx_gpcv2_set_core1_pdn_pup_by_software(bool pdn)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/imx_gpcv2_set_core1_pdn_pup_by_software +103 arch/arm/mach-imx/src.c

    93	
    94	/*
    95	 * The motivation for bringing up the second i.MX7D core inside the kernel
    96	 * is that legacy vendor bootloaders usually do not implement PSCI support.
    97	 * This is a significant blocker for systems in the field that are running old
    98	 * bootloader versions to upgrade to a modern mainline kernel version, as only
    99	 * one CPU of the i.MX7D would be brought up.
   100	 * Bring up the second i.MX7D core inside the kernel to make the migration
   101	 * path to mainline kernel easier for the existing iMX7D users.
   102	 */
 > 103	void imx_gpcv2_set_core1_pdn_pup_by_software(bool pdn)
   104	{
   105		u32 reg = pdn ? GPC_CPU_PGC_SW_PDN_REQ : GPC_CPU_PGC_SW_PUP_REQ;
   106		u32 val, pup;
   107		int ret;
   108	
   109		imx_gpcv2_set_m_core_pgc(true, GPC_PGC_C1);
   110		val = readl_relaxed(gpc_base + reg);
   111		val |= BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7;
   112		writel_relaxed(val, gpc_base + reg);
   113	
   114		ret = readl_relaxed_poll_timeout_atomic(gpc_base + reg, pup,
   115					!(pup & BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7),
   116					5, 1000000);
   117		if (ret < 0) {
   118			pr_err("i.MX7D: CORE1_A7 power up timeout\n");
   119			val &= ~BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7;
   120			writel_relaxed(val, gpc_base + reg);
   121		}
   122	
   123		imx_gpcv2_set_m_core_pgc(false, GPC_PGC_C1);
   124	}
   125	

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

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