uml: remove code made redundant by CHOOSE_MODE removal

This patch makes a number of simplifications enabled by the removal of
CHOOSE_MODE.  There were lots of functions that looked like

	int foo(args){
		foo_skas(args);
	}

The bodies of foo_skas are now folded into foo, and their declarations (and
sometimes entire header files) are deleted.

In addition, the union uml_pt_regs, which was a union between the tt and skas
register formats, is now a struct, with the tt-mode arm of the union being
removed.

It turns out that usr2_handler was unused, so it is gone.

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>
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index be3ffec..126df73 100644
--- a/include/asm-um/processor-generic.h
+++ b/include/asm-um/processor-generic.h
@@ -32,12 +32,8 @@
 	unsigned long temp_stack;
 	void *exec_buf;
 	struct arch_thread arch;
-	union {
-		struct {
-			jmp_buf switch_buf;
-			int mm_count;
-		} skas;
-	} mode;
+	jmp_buf switch_buf;
+	int mm_count;
 	struct {
 		int op;
 		union {
@@ -75,7 +71,10 @@
 
 extern struct task_struct *alloc_task_struct(void);
 
-extern void release_thread(struct task_struct *);
+static inline void release_thread(struct task_struct *task)
+{
+}
+
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 
 static inline void prepare_to_copy(struct task_struct *tsk)
@@ -125,8 +124,7 @@
 #endif
 
 
-#define KSTK_REG(tsk, reg) \
-	get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
+#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 #define get_wchan(p) (0)
 
 #endif