On Wed, Jan 24, 2018 at 4:05 AM, Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx> wrote: > > ... > With all that, this example code: > > static int __init 128bit_test(void) > { > __uint128_t v; > __uint128_t addr; > __uint128_t val = (__uint128_t) 0x1234567890abc; > ... In case it matters, you can check for GCC support of the 128-bit types in userland with: #if (__SIZEOF_INT128__ >= 16) ... #endif Also see https://gcc.gnu.org/ml/gcc-help/2015-08/msg00185.html . Jeff