Hi, I am using kernel version 4.14; and trying to compile KVM as kernel modules, yet I saw following errors: [kvm1 linux-4.14]$ make modules CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHK scripts/mod/devicetable-offsets.h Building modules, stage 2. MODPOST 24 modules ERROR: "preempt_notifier_unregister" [arch/x86/kvm/kvm.ko] undefined! ERROR: "preempt_notifier_dec" [arch/x86/kvm/kvm.ko] undefined! ERROR: "user_return_notifier_register" [arch/x86/kvm/kvm.ko] undefined! ERROR: "preempt_notifier_register" [arch/x86/kvm/kvm.ko] undefined! ERROR: "preempt_notifier_inc" [arch/x86/kvm/kvm.ko] undefined! ERROR: "user_return_notifier_unregister" [arch/x86/kvm/kvm.ko] undefined! make[1]: *** [__modpost] Error 1 make: *** [modules] Error 2 It looks like these preempt_notifier related functions are used in kvm_main.c, but the header files are not included in kvm_main.c, so I manually included <linux/preempt.h> (the file in which declared these functions), but still it doesn't work. Anyone seen this same problem or any suggestions? Thanks! Btw, CONFIG_PREEMPT_NOTIFIER is by default enabled: [kvm1 linux-4.14]$ cat .config | grep PREEMPT_NOTIFIER CONFIG_PREEMPT_NOTIFIERS=y -Jidong
