PKRU_BITS_PER_PKEY 1380 arch/x86/include/asm/pgtable.h #define PKRU_BITS_PER_PKEY 2
PKRU_BITS_PER_PKEY   17 tools/testing/selftests/x86/pkey-helpers.h #define PKRU_BITS_PER_PKEY 2