Hi Yangbo,

I love your patch! Yet something to improve:

[auto build test ERROR on 9d31d2338950293ec19d9b095fbaa9030899dcb4]

url:    https://github.com/0day-ci/linux/commits/Yangbo-Lu/ptp-support-virtual-clocks-for-multiple-domains/20210507-164927
base:   9d31d2338950293ec19d9b095fbaa9030899dcb4
config: microblaze-randconfig-s032-20210507 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/1f46e22fa0f24ac9acde10ca897266e0bac0f367
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yangbo-Lu/ptp-support-virtual-clocks-for-multiple-domains/20210507-164927
        git checkout 1f46e22fa0f24ac9acde10ca897266e0bac0f367
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/spi/spi.h:17,
                    from include/linux/iio/common/st_sensors.h:14,
                    from include/linux/iio/common/st_sensors_i2c.h:14,
                    from drivers/iio/common/st_sensors/st_sensors_i2c.c:16:

quoted

include/linux/ptp_clock_kernel.h:71:22: error: field 'cc' has incomplete type

      71 |  struct cyclecounter cc;
         |                      ^~

quoted

include/linux/ptp_clock_kernel.h:356:1: error: expected identifier or '(' before '{' token

     356 | { return NULL; }
         | ^

quoted

include/linux/ptp_clock_kernel.h:358:6: warning: no previous prototype for 'ptp_clock_domain_tstamp' [-Wmissing-prototypes]

     358 | void ptp_clock_domain_tstamp(struct device *dev, u64 *tstamp, u8 domain)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ptp_clock_kernel.h:355:38: warning: 'ptp_get_pclock_info' declared 'static' but never defined [-Wunused-function]
     355 | static inline struct ptp_clock_info *ptp_get_pclock_info(const struct cyclecounter *cc);
         |                                      ^~~~~~~~~~~~~~~~~~~


vim +/cc +71 include/linux/ptp_clock_kernel.h

    50	
    51	/**
    52	 * struct ptp_vclock_cc - ptp virtual clock cycle counter info
    53	 *
    54	 * @cc:               cyclecounter structure
    55	 * @refresh_interval: time interval to refresh time counter, to avoid 64-bit
    56	 *                    overflow during delta conversion. For example, with
    57	 *                    cc.mult value 2^28,  there are 36 bits left of cycle
    58	 *                    counter. With 1 ns counter resolution, the overflow time
    59	 *                    is 2^36 ns which is 68.7 s. The refresh_interval may be
    60	 *                    (60 * HZ) less than 68.7 s.
    61	 * @mult_num:         parameter for cc.mult adjustment calculation, see below
    62	 * @mult_dem:         parameter for cc.mult adjustment calculation, see below
    63	 *
    64	 * scaled_ppm to adjustment(mult_adj) of cc.mult
    65	 *
    66	 * mult_adj = mult * (ppb / 10^9)
    67	 *          = mult * (scaled_ppm * 1000 / 2^16) / 10^9
    68	 *          = scaled_ppm * mult_num / mult_dem
    69	 */
    70	struct ptp_vclock_cc {
  > 71		struct cyclecounter cc;
    72		unsigned long refresh_interval;
    73		u32 mult_num;
    74		u32 mult_dem;
    75	};
    76	

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