[PATCH] uml: fix timer initialization

In skas mode, the call to uml_idle_timer permanently shut off the virtual
timer, resulting in no timer ticks to anything but the idle thread.  This is
likely the cause of the soft lockups that are seen sporadically in recent
UMLs.
Signed-off-by: NJeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/um/kernel/process_kern.c

@@ -169,7 +169,7 @@ int current_pid(void)
 
 void default_idle(void)
 {
-	uml_idle_timer();
+	CHOOSE_MODE(uml_idle_timer(), (void) 0);
 
 	atomic_inc(&init_mm.mm_count);
 	current->mm = &init_mm;

arch/um/kernel/skas/process_kern.c

@@ -180,7 +180,6 @@ int start_uml_skas(void)
 	start_userspace(0);
 
 	init_new_thread_signals(1);
-	uml_idle_timer();
 
 	init_task.thread.request.u.thread.proc = start_kernel_proc;
 	init_task.thread.request.u.thread.arg = NULL;