[-mm Patch] uml: fix a building error

[WANG Cong]

This patch fixes this building error:
...
drivers/char/mem.c: In function âread_memâ:
drivers/char/mem.c:136: error: implicit declaration of function âunxlate_dev_mem_ptrâ
...

Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Signed-off-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>

---

Index: linux/include/asm-um/io.h
===================================================================
--- linux.orig/include/asm-um/io.h
+++ linux/include/asm-um/io.h
@@ -27,6 +27,7 @@ static inline void * phys_to_virt(unsign
  * access
  */
 #define xlate_dev_mem_ptr(p)	__va(p)
+#define unxlate_dev_mem_ptr(p, ptr)
 
 /*
  * Convert a virtual cached pointer to an uncached pointer
--
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