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diff --git a/sys/compat/linuxkpi/common/include/linux/io.h b/sys/compat/linuxkpi/common/include/linux/io.h
--- a/sys/compat/linuxkpi/common/include/linux/io.h
+++ b/sys/compat/linuxkpi/common/include/linux/io.h
@@ -411,8 +411,12 @@
#define ioremap(addr, size) \
_ioremap_attr((addr), (size), VM_MEMATTR_UNCACHEABLE)
#endif
+#ifdef VM_MEMATTR_WRITE_COMBINING
#define ioremap_wc(addr, size) \
_ioremap_attr((addr), (size), VM_MEMATTR_WRITE_COMBINING)
+#else
+#define ioremap_wc(addr, size) ioremap_nocache(addr, size)
+#endif
#define ioremap_wb(addr, size) \
_ioremap_attr((addr), (size), VM_MEMATTR_WRITE_BACK)
void iounmap(void *addr);
diff --git a/sys/compat/linuxkpi/common/include/linux/page.h b/sys/compat/linuxkpi/common/include/linux/page.h
--- a/sys/compat/linuxkpi/common/include/linux/page.h
+++ b/sys/compat/linuxkpi/common/include/linux/page.h
@@ -83,8 +83,12 @@
#define clear_page(page) memset(page, 0, PAGE_SIZE)
#define pgprot_noncached(prot) \
(((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_UNCACHEABLE))
+#ifdef VM_MEMATTR_WRITE_COMBINING
#define pgprot_writecombine(prot) \
(((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_WRITE_COMBINING))
+#else
+#define pgprot_writecombine(prot) pgprot_noncached(prot)
+#endif
#undef PAGE_MASK
#define PAGE_MASK (~(PAGE_SIZE-1))

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