Kernel test robot generates below warning -> >> arch/s390/kernel/vdso64/getcpu.c:8:5: warning: no previous prototype >> for function '__s390_vdso_getcpu' [-Wmissing-prototypes] int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) ^ arch/s390/kernel/vdso64/getcpu.c:8:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) ^ static 1 warning generated. vim +/__s390_vdso_getcpu +8 arch/s390/kernel/vdso64/getcpu.c 7 > 8 int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct > getcpu_cache *unused) It is fixed by adding a prototype. Reported-by: kernel test robot <lkp@xxxxxxxxx> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx> --- include/linux/getcpu.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/getcpu.h b/include/linux/getcpu.h index c304dcd..43c9208 100644 --- a/include/linux/getcpu.h +++ b/include/linux/getcpu.h @@ -16,4 +16,5 @@ struct getcpu_cache { unsigned long blob[128 / sizeof(long)]; }; +int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused); #endif -- 1.9.1