Hi Peter, kernel test robot noticed the following build warnings:
[auto build test WARNING on 9d8960672d63db4b3b04542f5622748b345c637a] url: https://github.com/intel-lab-lkp/linux/commits/Peter-Hilber/virtio_rtc-Add-module-and-driver-core/20250314-014130 base: 9d8960672d63db4b3b04542f5622748b345c637a patch link: https://lore.kernel.org/r/20250313173707.1492-3-quic_philber%40quicinc.com patch subject: [PATCH v6 2/4] virtio_rtc: Add PTP clocks config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20250319/202503190602.ielwb74j-...@intel.com/config) compiler: sparc64-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250319/202503190602.ielwb74j-...@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202503190602.ielwb74j-...@intel.com/ All warnings (new ones prefixed by >>): drivers/virtio/virtio_rtc_driver.c: In function 'viortc_probe': >> drivers/virtio/virtio_rtc_driver.c:665:23: warning: '/variant ' directive >> output may be truncated writing 9 bytes into a region of size between 6 and >> 15 [-Wformat-truncation=] "Virtio PTP type %d/variant %d", clock_type, ^~~~~~~~~ drivers/virtio/virtio_rtc_driver.c:665:4: note: directive argument in the range [0, 2147483647] "Virtio PTP type %d/variant %d", clock_type, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/virtio/virtio_rtc_driver.c:664:2: note: 'snprintf' output between 28 and 46 bytes into a destination of size 32 snprintf(ptp_clock_name, PTP_CLOCK_NAME_LEN, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Virtio PTP type %d/variant %d", clock_type, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ leap_second_smearing); ~~~~~~~~~~~~~~~~~~~~~ vim +665 drivers/virtio/virtio_rtc_driver.c 641 642 /* 643 * init, deinit 644 */ 645 646 /** 647 * viortc_init_ptp_clock() - init and register PTP clock 648 * @viortc: device data 649 * @vio_clk_id: virtio_rtc clock id 650 * @clock_type: virtio_rtc clock type 651 * @leap_second_smearing: virtio_rtc leap second smearing 652 * 653 * Context: Process context. 654 * Return: Positive if registered, zero if not supported by configuration, 655 * negative error code otherwise. 656 */ 657 static int viortc_init_ptp_clock(struct viortc_dev *viortc, u16 vio_clk_id, 658 u8 clock_type, u8 leap_second_smearing) 659 { 660 struct device *dev = &viortc->vdev->dev; 661 char ptp_clock_name[PTP_CLOCK_NAME_LEN]; 662 struct viortc_ptp_clock *vio_ptp; 663 664 snprintf(ptp_clock_name, PTP_CLOCK_NAME_LEN, > 665 "Virtio PTP type %d/variant %d", clock_type, 666 leap_second_smearing); 667 668 vio_ptp = viortc_ptp_register(viortc, dev, vio_clk_id, ptp_clock_name); 669 if (IS_ERR(vio_ptp)) { 670 dev_err(dev, "failed to register PTP clock '%s'\n", 671 ptp_clock_name); 672 return PTR_ERR(vio_ptp); 673 } 674 675 viortc->clocks_to_unregister[vio_clk_id] = vio_ptp; 676 677 return !!vio_ptp; 678 } 679 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
