Hello Dave, For s390(x) in the near future kernels can have more than 64 CPUs. So change the defines in "defs.h" accordingly. Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- defs.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/defs.h +++ b/defs.h @@ -125,10 +125,10 @@ #define NR_CPUS (2048) #endif #ifdef S390 -#define NR_CPUS (64) +#define NR_CPUS (512) #endif #ifdef S390X -#define NR_CPUS (64) +#define NR_CPUS (512) #endif #ifdef ARM #define NR_CPUS (4)