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: powerpc64-randconfig-r004-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # 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=clang make.cross ARCH=powerpc64 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 >>): clang-13: warning: argument unused during compilation: '-s' [-Wunused-command-line-argument] -- clang-13: warning: argument unused during compilation: '-shared' [-Wunused-command-line-argument] In file included from <built-in>:3: In file included from lib/vdso/gettimeofday.c:5: In file included from include/vdso/datapage.h:137: int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:143:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:5: note: previous declaration is here int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ return __cvdso_clock_gettime32_data(vd, clock, ts); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:10:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:25:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:5: note: previous declaration is here int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ return __cvdso_clock_getres_time32_data(vd, clock_id, res); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:28:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ 6 warnings and 4 errors generated. -- clang-13: warning: argument unused during compilation: '-shared' [-Wunused-command-line-argument] In file included from <built-in>:3: In file included from lib/vdso/gettimeofday.c:5: In file included from include/vdso/datapage.h:137: int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:143:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:5: note: previous declaration is here int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ return __cvdso_clock_gettime32_data(vd, clock, ts); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:10:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:25:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:5: note: previous declaration is here int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ return __cvdso_clock_getres_time32_data(vd, clock_id, res); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:28:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ 6 warnings and 4 errors generated. 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 'modules_prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- In file included from arch/powerpc/kernel/asm-offsets.c:14: In file included from include/linux/compat.h:14: In file included from include/linux/sem.h:5: In file included from include/uapi/linux/sem.h:5: In file included from include/linux/ipc.h:5: In file included from include/linux/spinlock.h:90: In file included from arch/powerpc/include/asm/spinlock.h:7: arch/powerpc/include/asm/qspinlock.h:40:49: warning: passing 'u32 *' (aka 'unsigned int *') to parameter of type 'int *' converts between pointers to integer types with different sign [-Wpointer-sign] if (likely(atomic_try_cmpxchg_lock(&lock->val, &val, _Q_LOCKED_VAL))) ^~~~ include/linux/compiler.h:77:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ arch/powerpc/include/asm/atomic.h:202:43: note: passing argument to parameter 'old' here atomic_try_cmpxchg_lock(atomic_t *v, int *old, int new) ^ In file included from arch/powerpc/kernel/asm-offsets.c:39: In file included from arch/powerpc/include/asm/dbell.h:17: In file included from arch/powerpc/include/asm/kvm_ppc.h:19: In file included from include/linux/kvm_host.h:37: In file included from arch/powerpc/include/asm/kvm_host.h:26: arch/powerpc/include/asm/hvcall.h:625:41: warning: field 'params' with variable sized type 'struct hv_get_perf_counter_info_params' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct hv_get_perf_counter_info_params params; ^ 2 warnings generated. clang-13clang-13: : warning: warning: -Wl,-a32: 'linker' input unused [-Wunused-command-line-argument] -Wl,-a32: 'linker' input unused [-Wunused-command-line-argument] clang-13clang-13: : warning: -Wl,-a32: 'linker' input unused [-Wunused-command-line-argument] warning: -Wl,-a32: 'linker' input unused [-Wunused-command-line-argument] clang-13: clang-13warning: : argument unused during compilation: '-s' [-Wunused-command-line-argument] warning: argument unused during compilation: '-s' [-Wunused-command-line-argument] clang-13: warning: argument unused during compilation: '-s' [-Wunused-command-line-argument] clang-13: warning: argument unused during compilation: '-s' [-Wunused-command-line-argument] clang-13: warning: argument unused during compilation: '-s' [-Wunused-command-line-argument] clang-13: warning: argument unused during compilation: '-shared' [-Wunused-command-line-argument] In file included from <built-in>:3: In file included from lib/vdso/gettimeofday.c:5: In file included from include/vdso/datapage.h:137: int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:143:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:54: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:202:5: note: previous declaration is here int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, ^ return __cvdso_clock_gettime32_data(vd, clock, ts); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:10:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:25:56: warning: declaration of 'struct old_timespec32' will not be visible outside of this function [-Wvisibility] int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ arch/powerpc/include/asm/vdso/gettimeofday.h:206:5: note: previous declaration is here int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, ^ return __cvdso_clock_getres_time32_data(vd, clock_id, res); ^ arch/powerpc/kernel/vdso32/vgettimeofday.c:28:9: note: did you mean '__cvdso_clock_gettime_data'? lib/vdso/gettimeofday.c:252:1: note: '__cvdso_clock_gettime_data' declared here __cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, ^ 6 warnings and 4 errors generated. 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 +/__c_kernel_clock_gettime +7 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 7 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