uml: current.h cleanup

Tidy current-related stuff.  There was a comment in current.h saying
that current_thread was obsolete, so this patch turns all instances of
current_thread into current_thread_info().  There's some simplifying
of the result in arch/um/sys-i386/signal.c.

current.h and thread_info also get style cleanups.

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/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
index 1407018..1a899a7 100644
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -81,7 +81,7 @@
 	if (err)
 		return 1;
 
-	err = restore_fp_registers(userspace_pid[current_thread->cpu],
+	err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
 				   (unsigned long *) &fp);
 	if (err < 0) {
 		printk(KERN_ERR "copy_sc_from_user - "
@@ -143,7 +143,7 @@
 	if (err)
 		return 1;
 
-	err = save_fp_registers(userspace_pid[current_thread->cpu],
+	err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
 				(unsigned long *) &fp);
 	if (err < 0) {
 		printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "