CC      drivers/iommu/amd_iommu_init.o
  CC      drivers/iommu/dmar.o
drivers/iommu/dmar.c: In function ‘dmar_hp_remove_drhd’:
drivers/iommu/dmar.c:1874:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses]
  if (!dmaru->include_all && dmaru->devices && dmaru->devices_cnt)
     ^
  CC      drivers/iommu/intel-iommu.o
drivers/iommu/intel-iommu.c: In function ‘dmar_check_one_atsr’:
drivers/iommu/intel-iommu.c:4275:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses]
  if (!atsru->include_all && atsru->devices && atsru->devices_cnt)
     ^