diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d7fac0a1761dd4ace08f7a406813874f300a9fc8..2aa7afd90c3e9f379c25ac3d813555637057f511 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3364,7 +3364,7 @@ static void __init init_iommu_pm_ops(void)
 static inline void init_iommu_pm_ops(void) {}
 #endif	/* CONFIG_PM */
 
-static int rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
+static int __init rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
 {
 	if (!IS_ALIGNED(rmrr->base_address, PAGE_SIZE) ||
 	    !IS_ALIGNED(rmrr->end_address + 1, PAGE_SIZE) ||