Hi gregkh, I love your patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [cannot apply to v4.20-rc3 next-20181120] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/gregkh-linuxfoundation-org/Patch-x86-hyper-v-Enable-PIT-shutdown-quirk-has-been-added-to-the-4-19-stable-tree/20181120-042611 config: x86_64-allmodconfig (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All error/warnings (new ones prefixed by >>): >> arch/x86/kernel/cpu/mshyperv.c:297:9: error: undefined identifier 'i8253_clear_counter_on_shutdown' arch/x86/kernel/cpu/mshyperv.c:320:41: warning: symbol 'x86_hyper_ms_hyperv' was not declared. Should it be static? >> arch/x86/kernel/cpu/mshyperv.c:297:9: warning: generating address of non-lvalue (3) arch/x86/kernel/cpu/mshyperv.c: In function 'ms_hyperv_init_platform': arch/x86/kernel/cpu/mshyperv.c:297:2: error: 'i8253_clear_counter_on_shutdown' undeclared (first use in this function) i8253_clear_counter_on_shutdown = false; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/cpu/mshyperv.c:297:2: note: each undeclared identifier is reported only once for each function it appears in vim +/i8253_clear_counter_on_shutdown +297 arch/x86/kernel/cpu/mshyperv.c 275 276 #if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE) 277 machine_ops.shutdown = hv_machine_shutdown; 278 machine_ops.crash_shutdown = hv_machine_crash_shutdown; 279 #endif 280 mark_tsc_unstable("running on Hyper-V"); 281 282 /* 283 * Generation 2 instances don't support reading the NMI status from 284 * 0x61 port. 285 */ 286 if (efi_enabled(EFI_BOOT)) 287 x86_platform.get_nmi_reason = hv_get_nmi_reason; 288 289 /* 290 * Hyper-V VMs have a PIT emulation quirk such that zeroing the 291 * counter register during PIT shutdown restarts the PIT. So it 292 * continues to interrupt @18.2 HZ. Setting i8253_clear_counter 293 * to false tells pit_shutdown() not to zero the counter so that 294 * the PIT really is shutdown. Generation 2 VMs don't have a PIT, 295 * and setting this value has no effect. 296 */ > 297 i8253_clear_counter_on_shutdown = false; 298 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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