diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 2ead723..24ee7bc 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -320,6 +320,15 @@ static struct vm_operations_struct pci_mmap_ops = {
 	.close = pci_unmap_page_range,
 };
 
+int arch_pci_resource_wc(struct resource *r)
+{
+	u8 ret;
+
+	ret = mtrr_type_lookup(r->start, r->end);
+
+	return (ret == MTRR_TYPE_WRCOMB);
+}
+
 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			enum pci_mmap_state mmap_state, int write_combine)
 {
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 8dcf145..9ee6d0f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -415,6 +415,12 @@ pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 #endif /* HAVE_PCI_LEGACY */
 
 #ifdef HAVE_PCI_MMAP
+static inline int __weak
+arch_pci_resource_wc(struct resource *r)
+{
+	return 0;
+}
+
 /**
  * pci_mmap_resource - map a PCI resource into user memory space
  * @kobj: kobject for mapping
@@ -433,6 +439,7 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 	struct resource *res = (struct resource *)attr->private;
 	enum pci_mmap_state mmap_type;
 	resource_size_t start, end;
+	int wc = 0;
 	int i;
 
 	for (i = 0; i < PCI_ROM_RESOURCE; i++)
@@ -449,7 +456,8 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 	vma->vm_pgoff += start >> PAGE_SHIFT;
 	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 
-	return pci_mmap_page_range(pdev, vma, mmap_type, 0);
+	wc = arch_pci_resource_wc(res);
+	return pci_mmap_page_range(pdev, vma, mmap_type, wc);
 }
 
 /**