Hi Joerg, Kernel build failed on tree: git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git irq-remapping head: afd6b14061a786c34b41722d35035d0eeecae55c commit: 710466a27a4c7e977428392b4929206e94428181 [15/28] iommu/amd: Check if IOAPIC information is correct config: x86_64-randconfig-tip7 (attached as .config) All related error/warning messages: drivers/iommu/amd_iommu_init.c: In function 'check_ioapic_information': drivers/iommu/amd_iommu_init.c:1585:22: error: 'nr_ioapics' undeclared (first use in this function) drivers/iommu/amd_iommu_init.c:1585:22: note: each undeclared identifier is reported only once for each function it appears in drivers/iommu/amd_iommu_init.c:1586:3: error: implicit declaration of function 'mpc_ioapic_id' [-Werror=implicit-function-declaration] vim +1585 drivers/iommu/amd_iommu_init.c 1582 { 1583 int idx; 1584 > 1585 for (idx = 0; idx < nr_ioapics; ++idx) { 1586 int id = mpc_ioapic_id(idx); 1587 1588 if (get_ioapic_devid(id) < 0) { --- 0-DAY kernel build testing backend Open Source Technology Centre Fengguang Wu Intel Corporation