Hi Chunyan,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/timers/core]
[also build test ERROR on linux/master linus/master v5.14-rc3 next-20210730]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Chunyan-Zhang/Add-module-build-support-for-timer-driver/20210715-145711
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 2d0a9eb23ccfdf11308bec6db0bc007585d919d2
config: s390-buildonly-randconfig-r003-20210728 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project c49df15c278857adecd12db6bb1cdc96885f7079)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/0day-ci/linux/commit/8e3c2c4da32affdbca933979110050e564351c84
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chunyan-Zhang/Add-module-build-support-for-timer-driver/20210715-145711
        git checkout 8e3c2c4da32affdbca933979110050e564351c84
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=s390 SHELL=/bin/bash

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 >>):

   s390x-linux-gnu-ld: drivers/tty/ipwireless/main.o: in function `ipwireless_attach':
   main.c:(.text+0x21a): undefined reference to `iounmap'
   s390x-linux-gnu-ld: main.c:(.text+0x270): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/tty/ipwireless/main.o: in function `ipwireless_detach':
   main.c:(.text+0x478): undefined reference to `iounmap'
   s390x-linux-gnu-ld: main.c:(.text+0x4d4): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/tty/ipwireless/main.o: in function `ipwireless_probe':
   main.c:(.text+0x70c): undefined reference to `ioremap'
   s390x-linux-gnu-ld: main.c:(.text+0x83e): undefined reference to `iounmap'
   s390x-linux-gnu-ld: main.c:(.text+0x8b6): undefined reference to `ioremap'
   s390x-linux-gnu-ld: main.c:(.text+0x93a): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/char/xillybus/xillybus_of.o: in function `xilly_drv_probe':
   xillybus_of.c:(.text+0x9a): undefined reference to `devm_platform_ioremap_resource'
   s390x-linux-gnu-ld: drivers/net/arcnet/arc-rimi.o: in function `check_mirror':
   arc-rimi.c:(.text+0x5c): undefined reference to `ioremap'
   s390x-linux-gnu-ld: arc-rimi.c:(.text+0xc2): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/net/arcnet/arc-rimi.o: in function `arc_rimi_exit':
   arc-rimi.c:(.exit.text+0x44): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/net/arcnet/arc-rimi.o: in function `arcrimi_found':
   arc-rimi.c:(.init.text+0x37c): undefined reference to `ioremap'
   s390x-linux-gnu-ld: arc-rimi.c:(.init.text+0x3c8): undefined reference to `iounmap'
   s390x-linux-gnu-ld: arc-rimi.c:(.init.text+0x614): undefined reference to `iounmap'
   s390x-linux-gnu-ld: arc-rimi.c:(.init.text+0x674): undefined reference to `ioremap'
   s390x-linux-gnu-ld: arc-rimi.c:(.init.text+0x6de): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/net/ethernet/fujitsu/fmvj18x_cs.o: in function `fmvj18x_probe':
   fmvj18x_cs.c:(.text+0x756): undefined reference to `ioremap'
   s390x-linux-gnu-ld: fmvj18x_cs.c:(.text+0x788): undefined reference to `iounmap'
   s390x-linux-gnu-ld: fmvj18x_cs.c:(.text+0x7e0): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/net/ethernet/fujitsu/fmvj18x_cs.o: in function `fmvj18x_detach':
   fmvj18x_cs.c:(.text+0xce0): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/net/ethernet/fujitsu/fmvj18x_cs.o: in function `fmvj18x_get_hwinfo':
   fmvj18x_cs.c:(.text+0x27d4): undefined reference to `ioremap'
   s390x-linux-gnu-ld: fmvj18x_cs.c:(.text+0x2940): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/pcmcia/cistpl.o: in function `release_cis_mem':
   cistpl.c:(.text+0x9c): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/pcmcia/cistpl.o: in function `set_cis_map':
   cistpl.c:(.text+0x46c): undefined reference to `ioremap'
   s390x-linux-gnu-ld: cistpl.c:(.text+0x4a8): undefined reference to `iounmap'
   s390x-linux-gnu-ld: cistpl.c:(.text+0x4e6): undefined reference to `iounmap'
   s390x-linux-gnu-ld: cistpl.c:(.text+0x4f8): undefined reference to `ioremap'
   s390x-linux-gnu-ld: drivers/crypto/ccree/cc_driver.o: in function `ccree_probe':
   cc_driver.c:(.text+0x5a8): undefined reference to `devm_ioremap_resource'
   s390x-linux-gnu-ld: drivers/crypto/ccree/cc_debugfs.o: in function `cc_debugfs_init':
   cc_debugfs.c:(.text+0xac): undefined reference to `debugfs_create_regset32'
   s390x-linux-gnu-ld: cc_debugfs.c:(.text+0x190): undefined reference to `debugfs_create_regset32'
   s390x-linux-gnu-ld: drivers/clocksource/timer-of.o: in function `timer_of_init':
   timer-of.c:(.text+0x104): undefined reference to `of_iomap'
>> s390x-linux-gnu-ld: timer-of.c:(.text+0x306): undefined reference to `iounmap'
   s390x-linux-gnu-ld: drivers/clocksource/timer-of.o: in function `timer_of_cleanup':
   timer-of.c:(.text+0x5f2): undefined reference to `iounmap'

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