diff --git a/sys/compat/linuxkpi/common/include/linux/gfp.h b/sys/compat/linuxkpi/common/include/linux/gfp.h
--- a/sys/compat/linuxkpi/common/include/linux/gfp.h
+++ b/sys/compat/linuxkpi/common/include/linux/gfp.h
@@ -89,15 +89,15 @@
  *
  * NOTE: This function only works for pages allocated by the kernel.
  */
-extern void *linux_page_address(struct page *);
+void *linux_page_address(struct page *);
 
 #define	page_address(page) linux_page_address(page)
 
 /*
  * Page management for unmapped pages:
  */
-extern struct page *linux_alloc_pages(gfp_t flags, unsigned int order);
-extern void linux_free_pages(struct page *page, unsigned int order);
+struct page *linux_alloc_pages(gfp_t flags, unsigned int order);
+void linux_free_pages(struct page *page, unsigned int order);
 void *linuxkpi_page_frag_alloc(struct page_frag_cache *, size_t, gfp_t);
 void linuxkpi_page_frag_free(void *);
 void linuxkpi__page_frag_cache_drain(struct page *, size_t);
@@ -146,8 +146,8 @@
 /*
  * Page management for mapped pages:
  */
-extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
-extern void linux_free_kmem(vm_offset_t, unsigned int order);
+vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
+void linux_free_kmem(vm_offset_t, unsigned int order);
 
 static inline vm_offset_t
 get_zeroed_page(gfp_t flags)