uml: throw out CHOOSE_MODE

The next stage after removing code which depends on CONFIG_MODE_TT is removing
the CHOOSE_MODE abstraction, which provided both compile-time and run-time
branching to either tt-mode or skas-mode code.

This patch removes choose-mode.h and all inclusions of it, and replaces all
CHOOSE_MODE invocations with the skas branch.  This leaves a number of trivial
functions which will be dealt with in a later patch.

There are some changes in the uaccess and tls support which go somewhat beyond
this and eliminate some of the now-redundant functions.

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/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
index 93df067..4a0def3 100644
--- a/arch/um/kernel/reboot.c
+++ b/arch/um/kernel/reboot.c
@@ -10,13 +10,12 @@
 #include "kern.h"
 #include "os.h"
 #include "mode.h"
-#include "choose-mode.h"
 
 void (*pm_power_off)(void);
 
 static void kill_off_processes(void)
 {
-	CHOOSE_MODE(kill_off_processes_tt(), kill_off_processes_skas());
+	kill_off_processes_skas();
 }
 
 void uml_cleanup(void)
@@ -29,13 +28,13 @@
 void machine_restart(char * __unused)
 {
         uml_cleanup();
-	CHOOSE_MODE(reboot_tt(), reboot_skas());
+	reboot_skas();
 }
 
 void machine_power_off(void)
 {
         uml_cleanup();
-	CHOOSE_MODE(halt_tt(), halt_skas());
+	halt_skas();
 }
 
 void machine_halt(void)