[Patch] uml: fix undeclared variables

[AmÃrico Wang]

Fix three compile errors about undeclared variables in
arch/um/kernel/mem.c.

Signed-off-by: WANG Cong <wangcong@xxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>


---
diff --git a/arch/um/include/asm/fixmap.h b/arch/um/include/asm/fixmap.h
index 69c0252..0af143d 100644
--- a/arch/um/include/asm/fixmap.h
+++ b/arch/um/include/asm/fixmap.h
@@ -41,6 +41,9 @@ enum fixed_addresses {
 	__end_of_fixed_addresses
 };
 
+extern pte_t *pkmap_page_table;
+extern pte_t *kmap_pte;
+extern pgprot_t kmap_prot;
 extern void __set_fixmap (enum fixed_addresses idx,
 			  unsigned long phys, pgprot_t flags);
 
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