Hi Sean, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on kvm/queue] [also build test ERROR on vhost/linux-next linus/master v5.12-rc7 next-20210413] [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/Sean-Christopherson/KVM-Fix-tick... base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue config: arm64-randconfig-r033-20210413 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/812e089ce79e0e9d5a7b8063fbdb44961... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Christopherson/KVM-Fix-tick-based-vtime-accounting-on-x86/20210414-023106 git checkout 812e089ce79e0e9d5a7b8063fbdb4496174f30f5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/hardirq.h:9, from include/linux/kvm_host.h:7, from arch/arm64/kernel/asm-offsets.c:14: include/linux/vtime.h: In function 'vtime_account_guest_enter': include/linux/vtime.h:68:3: error: implicit declaration of function 'vtime_guest_enter' [-Werror=implicit-function-declaration] 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h: In function 'vtime_account_guest_exit': include/linux/vtime.h:76:3: error: implicit declaration of function 'vtime_guest_exit' [-Werror=implicit-function-declaration] 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h: At top level: include/linux/vtime.h:111:13: warning: conflicting types for 'vtime_guest_enter' 111 | extern void vtime_guest_enter(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:68:3: note: previous implicit declaration of 'vtime_guest_enter' was here 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:112:13: warning: conflicting types for 'vtime_guest_exit' 112 | extern void vtime_guest_exit(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h:76:3: note: previous implicit declaration of 'vtime_guest_exit' was here 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ In file included from include/linux/kvm_host.h:25, from arch/arm64/kernel/asm-offsets.c:14: include/linux/context_tracking.h: In function 'context_tracking_guest_enter_irqoff': include/linux/context_tracking.h:79:9: error: 'return' with a value, in function returning void [-Werror=return-type] 79 | return context_tracking_enabled_this_cpu(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/context_tracking.h:74:29: note: declared here 74 | static __always_inline void context_tracking_guest_enter_irqoff(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/kernel/asm-offsets.c:14: include/linux/kvm_host.h: In function 'guest_enter_irqoff': 354 | if (!context_tracking_guest_enter_irqoff()) { | ^ cc1: some warnings being treated as errors -- In file included from include/linux/hardirq.h:9, from include/linux/kvm_host.h:7, from arch/arm64/kernel/asm-offsets.c:14: include/linux/vtime.h: In function 'vtime_account_guest_enter': include/linux/vtime.h:68:3: error: implicit declaration of function 'vtime_guest_enter' [-Werror=implicit-function-declaration] 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h: In function 'vtime_account_guest_exit': include/linux/vtime.h:76:3: error: implicit declaration of function 'vtime_guest_exit' [-Werror=implicit-function-declaration] 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h: At top level: include/linux/vtime.h:111:13: warning: conflicting types for 'vtime_guest_enter' 111 | extern void vtime_guest_enter(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:68:3: note: previous implicit declaration of 'vtime_guest_enter' was here 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:112:13: warning: conflicting types for 'vtime_guest_exit' 112 | extern void vtime_guest_exit(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h:76:3: note: previous implicit declaration of 'vtime_guest_exit' was here 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ In file included from include/linux/kvm_host.h:25, from arch/arm64/kernel/asm-offsets.c:14: include/linux/context_tracking.h: In function 'context_tracking_guest_enter_irqoff': include/linux/context_tracking.h:79:9: error: 'return' with a value, in function returning void [-Werror=return-type] 79 | return context_tracking_enabled_this_cpu(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/context_tracking.h:74:29: note: declared here 74 | static __always_inline void context_tracking_guest_enter_irqoff(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/kernel/asm-offsets.c:14: include/linux/kvm_host.h: In function 'guest_enter_irqoff': 354 | if (!context_tracking_guest_enter_irqoff()) { | ^ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:116: arch/arm64/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1235: prepare0] Error 2 make[1]: Target 'modules_prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- In file included from include/linux/hardirq.h:9, from include/linux/kvm_host.h:7, from arch/arm64/kernel/asm-offsets.c:14: include/linux/vtime.h: In function 'vtime_account_guest_enter': include/linux/vtime.h:68:3: error: implicit declaration of function 'vtime_guest_enter' [-Werror=implicit-function-declaration] 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h: In function 'vtime_account_guest_exit': include/linux/vtime.h:76:3: error: implicit declaration of function 'vtime_guest_exit' [-Werror=implicit-function-declaration] 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h: At top level: include/linux/vtime.h:111:13: warning: conflicting types for 'vtime_guest_enter' 111 | extern void vtime_guest_enter(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:68:3: note: previous implicit declaration of 'vtime_guest_enter' was here 68 | vtime_guest_enter(current); | ^~~~~~~~~~~~~~~~~ include/linux/vtime.h:112:13: warning: conflicting types for 'vtime_guest_exit' 112 | extern void vtime_guest_exit(struct task_struct *tsk); | ^~~~~~~~~~~~~~~~ include/linux/vtime.h:76:3: note: previous implicit declaration of 'vtime_guest_exit' was here 76 | vtime_guest_exit(current); | ^~~~~~~~~~~~~~~~ In file included from include/linux/kvm_host.h:25, from arch/arm64/kernel/asm-offsets.c:14: include/linux/context_tracking.h: In function 'context_tracking_guest_enter_irqoff': include/linux/context_tracking.h:79:9: error: 'return' with a value, in function returning void [-Werror=return-type] 79 | return context_tracking_enabled_this_cpu(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/context_tracking.h:74:29: note: declared here 74 | static __always_inline void context_tracking_guest_enter_irqoff(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/kernel/asm-offsets.c:14: include/linux/kvm_host.h: In function 'guest_enter_irqoff': 354 | if (!context_tracking_guest_enter_irqoff()) { | ^ cc1: some warnings being treated as errors make[2]: *** [scripts/Makefile.build:116: arch/arm64/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1235: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +354 include/linux/kvm_host.h 334 335 /* must be called with irqs disabled */ 336 static __always_inline void guest_enter_irqoff(void) 337 { 338 /* 339 * This is running in ioctl context so its safe to assume that it's the 340 * stime pending cputime to flush. 341 */ 342 instrumentation_begin(); 343 vtime_account_guest_enter(); 344 instrumentation_end(); 345 346 /* 347 * KVM does not hold any references to rcu protected data when it 348 * switches CPU into a guest mode. In fact switching to a guest mode 349 * is very similar to exiting to userspace from rcu point of view. In 350 * addition CPU may stay in a guest mode for quite a long time (up to 351 * one time slice). Lets treat guest mode as quiescent state, just like 352 * we do with user-mode execution. 353 */ 355 instrumentation_begin(); 356 rcu_virt_note_context_switch(smp_processor_id()); 357 instrumentation_end(); 358 } 359 } 360 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org