Hi Michael, Thank you for the patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on tip/timers/core efi/next linus/master v5.11 next-20210218] [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/Michael-Kelley/Enable-Linux-guests-on-Hyper-V-on-ARM64/20210219-072336 base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: i386-randconfig-a003-20210218 (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/a8eb25332c441e0965c0ecdfb1a86b507e3465e1 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Michael-Kelley/Enable-Linux-guests-on-Hyper-V-on-ARM64/20210219-072336 git checkout a8eb25332c441e0965c0ecdfb1a86b507e3465e1 # 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 All errors (new ones prefixed by >>): drivers/clocksource/hyperv_timer.c:478:44: warning: 'struct acpi_table_header' declared inside parameter list will not be visible outside of this definition or declaration 478 | static int __init hyperv_timer_init(struct acpi_table_header *table) | ^~~~~~~~~~~~~~~~~ drivers/clocksource/hyperv_timer.c: In function 'hyperv_timer_init': >> drivers/clocksource/hyperv_timer.c:484:6: error: too many arguments to function 'hv_stimer_alloc' 484 | if (hv_stimer_alloc(true)) | ^~~~~~~~~~~~~~~ drivers/clocksource/hyperv_timer.c:173:5: note: declared here 173 | int hv_stimer_alloc(void) | ^~~~~~~~~~~~~~~ In file included from include/linux/clockchips.h:14, from drivers/clocksource/hyperv_timer.c:16: drivers/clocksource/hyperv_timer.c: At top level: >> include/linux/clocksource.h:283:50: error: expected ')' before numeric constant 283 | ACPI_DECLARE_PROBE_ENTRY(timer, name, table_id, 0, NULL, 0, fn) | ^ drivers/clocksource/hyperv_timer.c:489:1: note: in expansion of macro 'TIMER_ACPI_DECLARE' 489 | TIMER_ACPI_DECLARE(hyperv, ACPI_SIG_GTDT, hyperv_timer_init); | ^~~~~~~~~~~~~~~~~~ drivers/clocksource/hyperv_timer.c:478:19: warning: 'hyperv_timer_init' defined but not used [-Wunused-function] 478 | static int __init hyperv_timer_init(struct acpi_table_header *table) | ^~~~~~~~~~~~~~~~~ vim +/hv_stimer_alloc +484 drivers/clocksource/hyperv_timer.c 476 477 /* Initialize everything on ARM64 */ 478 static int __init hyperv_timer_init(struct acpi_table_header *table) 479 { 480 if (!hv_is_hyperv_initialized()) 481 return -EINVAL; 482 483 hv_init_clocksource(); > 484 if (hv_stimer_alloc(true)) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org