Hi Jianyong, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.10-rc3 next-20201111] [cannot apply to tip/timers/core kvmarm/next kvm/linux-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jianyong-Wu/Enable-ptp_kvm-for-a... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git eccc876724927ff3b9ff91f36f7b6b159e948f0c config: i386-randconfig-p002-20201111 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/8cc52e023b81a9f561cc2094ecdd7266f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jianyong-Wu/Enable-ptp_kvm-for-arm-arm64/20201111-142600 git checkout 8cc52e023b81a9f561cc2094ecdd7266f5e29230 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 21 | int kvm_arch_ptp_init(void) | ^~~~~~~~~~~~~~~~~ 41 | int kvm_arch_ptp_get_clock(struct timespec64 *ts) | ^~~~~~~~~~~~~~~~~~~~~~ 59 | int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *tspec, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/kvm_arch_ptp_init +21 drivers/ptp/ptp_kvm_x86.c 20 22 { 23 long ret; 24 25 if (!kvm_para_available()) 26 return -ENODEV; 27 28 clock_pair_gpa = slow_virt_to_phys(&clock_pair); 29 hv_clock = pvclock_get_pvti_cpu0_va(); 30 if (!hv_clock) 31 return -ENODEV; 32 33 ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa, 34 KVM_CLOCK_PAIRING_WALLCLOCK); 35 if (ret == -KVM_ENOSYS || ret == -KVM_EOPNOTSUPP) 36 return -ENODEV; 37 38 return 0; 39 } 40 42 { 43 unsigned long ret; 44 45 ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, 46 clock_pair_gpa, 47 KVM_CLOCK_PAIRING_WALLCLOCK); 48 if (ret != 0) { 49 pr_err_ratelimited("clock offset hypercall ret %lu\n", ret); 50 return -EOPNOTSUPP; 51 } 52 53 ts->tv_sec = clock_pair.sec; 54 ts->tv_nsec = clock_pair.nsec; 55 56 return 0; 57 } 58 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org