Hi Roman, kernel test robot noticed the following build errors: [auto build test ERROR on d9016a249be5316ec2476f9947356711e70a16ec] url: https://github.com/intel-lab-lkp/linux/commits/Roman-Kisel/Documentation-hyperv-Confidential-VMBus/20250715-062125 base: d9016a249be5316ec2476f9947356711e70a16ec patch link: https://lore.kernel.org/r/20250714221545.5615-4-romank%40linux.microsoft.com patch subject: [PATCH hyperv-next v4 03/16] arch: hyperv: Get/set SynIC synth.registers via paravisor config: i386-buildonly-randconfig-005-20250715 (https://download.01.org/0day-ci/archive/20250715/202507152017.8UNXIbRJ-lkp@xxxxxxxxx/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250715/202507152017.8UNXIbRJ-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202507152017.8UNXIbRJ-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): In file included from arch/x86/kvm/vmx/main.c:5: In file included from arch/x86/kvm/vmx/vmx.h:16: In file included from arch/x86/kvm/vmx/vmx_ops.h:9: In file included from arch/x86/kvm/vmx/vmx_onhyperv.h:7: In file included from arch/x86/include/asm/mshyperv.h:345: >> include/asm-generic/mshyperv.h:377:4: error: call to undeclared function 'hv_para_set_synic_register'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 377 | hv_para_set_synic_register(HV_MSR_EOM, 0); | ^ 1 error generated. -- In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:9: In file included from arch/x86/include/asm/mshyperv.h:345: >> include/asm-generic/mshyperv.h:377:4: error: call to undeclared function 'hv_para_set_synic_register'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 377 | hv_para_set_synic_register(HV_MSR_EOM, 0); | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds] 98 | return (set->sig[3] | set->sig[2] | | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds] 98 | return (set->sig[3] | set->sig[2] | | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 114 | return (set1->sig[3] == set2->sig[3]) && | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 114 | return (set1->sig[3] == set2->sig[3]) && | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 115 | (set1->sig[2] == set2->sig[2]) && | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:115:21: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 115 | (set1->sig[2] == set2->sig[2]) && | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:157:1: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 157 | _SIG_SET_BINOP(sigorsets, _sig_or) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/signal.h:138:8: note: expanded from macro '_SIG_SET_BINOP' 138 | a3 = a->sig[3]; a2 = a->sig[2]; \ | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:157:1: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 157 | _SIG_SET_BINOP(sigorsets, _sig_or) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/signal.h:138:24: note: expanded from macro '_SIG_SET_BINOP' 138 | a3 = a->sig[3]; a2 = a->sig[2]; \ | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; | ^ In file included from arch/x86/kvm/svm/hyperv.c:7: In file included from arch/x86/kvm/svm/hyperv.h:11: In file included from arch/x86/kvm/svm/../hyperv.h:24: In file included from include/linux/kvm_host.h:11: include/linux/signal.h:157:1: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds] 157 | _SIG_SET_BINOP(sigorsets, _sig_or) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/signal.h:139:8: note: expanded from macro '_SIG_SET_BINOP' 139 | b3 = b->sig[3]; b2 = b->sig[2]; \ | ^ ~ arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here 24 | unsigned long sig[_NSIG_WORDS]; vim +/hv_para_set_synic_register +377 include/asm-generic/mshyperv.h 344 345 /* Free the message slot and signal end-of-message if required */ 346 static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) 347 { 348 /* 349 * On crash we're reading some other CPU's message page and we need 350 * to be careful: this other CPU may already had cleared the header 351 * and the host may already had delivered some other message there. 352 * In case we blindly write msg->header.message_type we're going 353 * to lose it. We can still lose a message of the same type but 354 * we count on the fact that there can only be one 355 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages 356 * on crash. 357 */ 358 if (cmpxchg(&msg->header.message_type, old_msg_type, 359 HVMSG_NONE) != old_msg_type) 360 return; 361 362 /* 363 * The cmxchg() above does an implicit memory barrier to 364 * ensure the write to MessageType (ie set to 365 * HVMSG_NONE) happens before we read the 366 * MessagePending and EOMing. Otherwise, the EOMing 367 * will not deliver any more messages since there is 368 * no empty slot 369 */ 370 if (msg->header.message_flags.msg_pending) { 371 /* 372 * This will cause message queue rescan to 373 * possibly deliver another msg from the 374 * hypervisor 375 */ 376 if (vmbus_is_confidential()) > 377 hv_para_set_synic_register(HV_MSR_EOM, 0); 378 else 379 hv_set_msr(HV_MSR_EOM, 0); 380 } 381 } 382 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
