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>

arch/um/drivers/chan_user.c

@@ -264,8 +264,7 @@ void register_winch(int fd, struct tty_struct *tty)
 		return;
 
 	pid = tcgetpgrp(fd);
-	if (!CHOOSE_MODE_PROC(is_tracer_winch, is_skas_winch, pid, fd, tty) &&
-	    (pid == -1)) {
+	if (!is_skas_winch(pid, fd, tty) && (pid == -1)) {
 		thread = winch_tramp(fd, tty, &thread_fd, &stack);
 		if (thread < 0)
 			return;

arch/um/drivers/harddog_user.c

@@ -9,7 +9,6 @@
 #include "user.h"
 #include "mconsole.h"
 #include "os.h"
-#include "choose-mode.h"
 #include "mode.h"
 
 struct dog_data {
@@ -64,7 +63,7 @@ int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
 	}
 	else {
 		/* XXX The os_getpid() is not SMP correct */
-		sprintf(pid_buf, "%d", CHOOSE_MODE(tracing_pid, os_getpid()));
+		sprintf(pid_buf, "%d", os_getpid());
 		args = pid_args;
 	}
 

arch/um/drivers/mconsole_kern.c

@@ -33,7 +33,6 @@
 #include "init.h"
 #include "os.h"
 #include "irq_kern.h"
-#include "choose-mode.h"
 
 static int do_unlink_socket(struct notifier_block *notifier,
 			    unsigned long what, void *data)