Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git randconfig-v5.12 head: fd21c2581b744639b5207c11651ab40abf13701a commit: c43a5a05c0cd6cc79fa4cf9400d94faf4f663b6f [323/597] fixup warnings config: powerpc-randconfig-r025-20210318 (attached as .config) compiler: powerpc-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://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground randconfig-v5.12 git checkout c43a5a05c0cd6cc79fa4cf9400d94faf4f663b6f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: 137 | int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:143:54: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 143 | int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:202:54: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 202 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:206:56: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 206 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~ 7 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c:7:5: error: conflicting types for '__c_kernel_clock_gettime' 7 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: arch/powerpc/include/asm/vdso/gettimeofday.h:202:5: note: previous declaration of '__c_kernel_clock_gettime' was here 202 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c: In function '__c_kernel_clock_gettime': 10 | return __cvdso_clock_gettime32_data(vd, clock, ts); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_gettime_data arch/powerpc/kernel/vdso32/vgettimeofday.c: At top level: arch/powerpc/kernel/vdso32/vgettimeofday.c:25:56: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 25 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c:25:5: error: conflicting types for '__c_kernel_clock_getres' 25 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: arch/powerpc/include/asm/vdso/gettimeofday.h:206:5: note: previous declaration of '__c_kernel_clock_getres' was here 206 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c: In function '__c_kernel_clock_getres': 28 | return __cvdso_clock_getres_time32_data(vd, clock_id, res); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_gettime_data cc1: some warnings being treated as errors -- In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: 137 | int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:143:54: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 143 | int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:202:54: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 202 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~ arch/powerpc/include/asm/vdso/gettimeofday.h:206:56: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 206 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~ 7 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c:7:5: error: conflicting types for '__c_kernel_clock_gettime' 7 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: arch/powerpc/include/asm/vdso/gettimeofday.h:202:5: note: previous declaration of '__c_kernel_clock_gettime' was here 202 | int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c: In function '__c_kernel_clock_gettime': 10 | return __cvdso_clock_gettime32_data(vd, clock, ts); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_gettime_data arch/powerpc/kernel/vdso32/vgettimeofday.c: At top level: arch/powerpc/kernel/vdso32/vgettimeofday.c:25:56: warning: 'struct old_timespec32' declared inside parameter list will not be visible outside of this definition or declaration 25 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c:25:5: error: conflicting types for '__c_kernel_clock_getres' 25 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/vdso/datapage.h:137, from lib/vdso/gettimeofday.c:5, from <command-line>: arch/powerpc/include/asm/vdso/gettimeofday.h:206:5: note: previous declaration of '__c_kernel_clock_getres' was here 206 | int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, | ^~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/vdso32/vgettimeofday.c: In function '__c_kernel_clock_getres': 28 | return __cvdso_clock_getres_time32_data(vd, clock_id, res); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | __cvdso_clock_gettime_data cc1: some warnings being treated as errors make[2]: *** [arch/powerpc/kernel/vdso32/Makefile:57: arch/powerpc/kernel/vdso32/vgettimeofday.o] Error 1 make[2]: Target 'include/generated/vdso32-offsets.h' not remade because of errors. make[1]: *** [arch/powerpc/Makefile:423: vdso_prepare] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +10 arch/powerpc/kernel/vdso32/vgettimeofday.c ce7d8056e38b77 Christophe Leroy 2020-11-27 6 ce7d8056e38b77 Christophe Leroy 2020-11-27 @7 int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ce7d8056e38b77 Christophe Leroy 2020-11-27 8 const struct vdso_data *vd) ce7d8056e38b77 Christophe Leroy 2020-11-27 9 { ce7d8056e38b77 Christophe Leroy 2020-11-27 @10 return __cvdso_clock_gettime32_data(vd, clock, ts); ce7d8056e38b77 Christophe Leroy 2020-11-27 11 } ce7d8056e38b77 Christophe Leroy 2020-11-27 12 d0e3fc69d00d1f Christophe Leroy 2020-11-27 13 int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts, d0e3fc69d00d1f Christophe Leroy 2020-11-27 14 const struct vdso_data *vd) d0e3fc69d00d1f Christophe Leroy 2020-11-27 15 { d0e3fc69d00d1f Christophe Leroy 2020-11-27 16 return __cvdso_clock_gettime_data(vd, clock, ts); d0e3fc69d00d1f Christophe Leroy 2020-11-27 17 } d0e3fc69d00d1f Christophe Leroy 2020-11-27 18 ce7d8056e38b77 Christophe Leroy 2020-11-27 19 int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, ce7d8056e38b77 Christophe Leroy 2020-11-27 20 const struct vdso_data *vd) ce7d8056e38b77 Christophe Leroy 2020-11-27 21 { ce7d8056e38b77 Christophe Leroy 2020-11-27 22 return __cvdso_gettimeofday_data(vd, tv, tz); ce7d8056e38b77 Christophe Leroy 2020-11-27 23 } ce7d8056e38b77 Christophe Leroy 2020-11-27 24 ce7d8056e38b77 Christophe Leroy 2020-11-27 25 int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ce7d8056e38b77 Christophe Leroy 2020-11-27 26 const struct vdso_data *vd) ce7d8056e38b77 Christophe Leroy 2020-11-27 27 { ce7d8056e38b77 Christophe Leroy 2020-11-27 @28 return __cvdso_clock_getres_time32_data(vd, clock_id, res); ce7d8056e38b77 Christophe Leroy 2020-11-27 29 } ce7d8056e38b77 Christophe Leroy 2020-11-27 30 :::::: The code at line 10 was first introduced by commit :::::: ce7d8056e38b770f070fc4499c577322b6ccb9c7 powerpc/vdso: Prepare for switching VDSO to generic C implementation. :::::: TO: Christophe Leroy <christophe.leroy(a)csgroup.eu&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org