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:26:0,
                    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

vim +101 arch/x86/include/asm/vdso/gettimeofday.h

    96	
    97	static __always_inline
    98	long clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
    99	{
   100		struct __kernel_timespec ts;
 > 101		int ret = clock_gettime_fallback(clock, &ts);
   102	
   103		if (likely(!ret)) {
   104			_ts->tv_sec = ts.tv_sec;
   105			_ts->tv_nsec = ts.tv_nsec;
   106		}
   107		return ret;
   108	}
   109	

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