KEY_RW
error = x86_pkru_set_perm(KEY_RW, 1, 1);
error = x86_pkru_protect_range(addr, PAGE_SIZE, KEY_RW, 0);
error = x86_pkru_protect_range(addr, ps[i] - PAGE_SIZE, KEY_RW,
KEY_RW, 0);
error = x86_pkru_protect_range(addr + 1, ps[i], KEY_RW, 0);
case KEY_RW:
ps[i] - PAGE_SIZE, KEY_RW, 0);