uml: LDT mutex conversion

The ldt.semaphore conforms to the new struct mutex requirments, so I converted
it to use the new API and changed the name.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-um/ldt.h

@@ -8,7 +8,7 @@
 #ifndef __ASM_LDT_H
 #define __ASM_LDT_H
 
-#include "asm/semaphore.h"
+#include <linux/mutex.h>
 #include "asm/host_ldt.h"
 
 extern void ldt_host_info(void);
@@ -27,7 +27,7 @@ struct ldt_entry {
 
 typedef struct uml_ldt {
 	int entry_count;
-	struct semaphore semaphore;
+	struct mutex lock;
 	union {
 		struct ldt_entry * pages[LDT_PAGES_MAX];
 		struct ldt_entry entries[LDT_DIRECT_ENTRIES];