Hi Christophe,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on v5.5-rc3]
[also build test ERROR on next-20191220]
[cannot apply to powerpc/next arm64/for-next/core tip/timers/vdso]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Christophe-Leroy/powerpc-32-switch-VDSO-to-C-implementation/20191225-085921
base:    46cf053efec6a3a5f343fead837777efe8252a46
config: x86_64-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   In file included from arch/x86//entry/vdso/../../../../lib/vdso/gettimeofday.c:23:0,
                    from arch/x86//entry/vdso/vclock_gettime.c:15:
   arch/x86/include/asm/vdso/gettimeofday.h: In function 'clock_gettime32_fallback':
   arch/x86/include/asm/vdso/gettimeofday.h:101:35: error: 'clock' undeclared (first use in this function); did you mean 'k_clock'?
     int ret = clock_gettime_fallback(clock, &ts);
                                      ^~~~~
                                      k_clock
   arch/x86/include/asm/vdso/gettimeofday.h:101:35: note: each undeclared identifier is reported only once for each function it appears in
   arch/x86/include/asm/vdso/gettimeofday.h: In function 'clock_getres32_fallback':
   arch/x86/include/asm/vdso/gettimeofday.h:114:34: error: 'clock' undeclared (first use in this function); did you mean 'k_clock'?
     int ret = clock_getres_fallback(clock, &ts);
                                     ^~~~~
                                     k_clock
   arch/x86//entry/vdso/vclock_gettime.c: In function '__vdso_clock_getres':
>> arch/x86//entry/vdso/vclock_gettime.c:62:34: error: 'clock_id' undeclared (first use in this function); did you mean 'clock_t'?
     int ret =  __cvdso_clock_getres(clock_id, res);
                                     ^~~~~~~~
                                     clock_t

vim +62 arch/x86//entry/vdso/vclock_gettime.c

    55	
    56	int clock_gettime(clockid_t, struct __kernel_timespec *)
    57		__attribute__((weak, alias("__vdso_clock_gettime")));
    58	
    59	int __vdso_clock_getres(clockid_t clock,
    60				struct __kernel_timespec *res)
    61	{
  > 62		int ret =  __cvdso_clock_getres(clock_id, res);
    63	
    64		if (likely(!ret))
    65			return ret;
    66	
    67		return clock_getres_fallback(clock, res);
    68	}
    69	int clock_getres(clockid_t, struct __kernel_timespec *)
    70		__attribute__((weak, alias("__vdso_clock_getres")));
    71	

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