[thierryreding:for-5.13/work 21/59] drivers/tty/serial/tegra-tcu.c:311:10: error: implicit declaration of function 'readl'

[thierryreding:for-5.13/work 21/59] drivers/tty/serial/tegra-tcu.c:311:10: error: implicit declaration of function 'readl'

[kernel test robot]

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tree:   https://github.com/thierryreding/linux for-5.13/work
head:   6faf2d6934c70d1786de0e373d178559f6eae8db
commit: 1c62098a5805d605d22a2468ec3aaeecf53f0c67 [21/59] tty: serial: tegra-tcu: Add earlycon support
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-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://github.com/thierryreding/linux/commit/1c62098a5805d605d22a2468ec3aaeecf53f0c67
        git remote add thierryreding https://github.com/thierryreding/linux
        git fetch --no-tags thierryreding for-5.13/work
        git checkout 1c62098a5805d605d22a2468ec3aaeecf53f0c67
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=s390 

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

All errors (new ones prefixed by >>):

   drivers/tty/serial/tegra-tcu.c: In function 'update_and_send_mbox':
>> drivers/tty/serial/tegra-tcu.c:311:10: error: implicit declaration of function 'readl' [-Werror=implicit-function-declaration]
     311 |   while (readl(addr) & TCU_MBOX_FULL)
         |          ^~~~~
>> drivers/tty/serial/tegra-tcu.c:314:3: error: implicit declaration of function 'writel' [-Werror=implicit-function-declaration]
     314 |   writel(value, addr);
         |   ^~~~~~
   cc1: some warnings being treated as errors


vim +/readl +311 drivers/tty/serial/tegra-tcu.c

   297	
   298	static u32 update_and_send_mbox(u8 __iomem *addr, u32 value, char c)
   299	{
   300		unsigned int bytes = TCU_MBOX_NUM_BYTES_V(value);
   301	
   302		value |= TCU_MBOX_FULL;
   303		value |= c << (bytes * 8);
   304		bytes++;
   305	
   306		value &= ~TCU_MBOX_NUM_BYTES(3);
   307		value |= TCU_MBOX_NUM_BYTES(bytes);
   308	
   309		if (bytes == 3) {
   310			/* Send current packet to SPE */
 > 311			while (readl(addr) & TCU_MBOX_FULL)
   312				cpu_relax();
   313	
 > 314			writel(value, addr);
   315			value = TCU_MBOX_FULL;
   316		}
   317	
   318		return value;
   319	}
   320	

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

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