Use boot based time for uptime in /proc

Commit 411187fb05cd11676b0979d9fbf3291db69dbce2 caused uptime not to increase
during suspend.  This may cause confusion so I restore the old behaviour by
using the boot based time instead of monotonic for uptime.

Signed-off-by: Tomas Janousek <tjanouse@redhat.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/timer.c b/kernel/timer.c
index 1a69705..1ab3106 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1114,6 +1114,7 @@
 		getnstimeofday(&tp);
 		tp.tv_sec += wall_to_monotonic.tv_sec;
 		tp.tv_nsec += wall_to_monotonic.tv_nsec;
+		monotonic_to_bootbased(&tp);
 		if (tp.tv_nsec - NSEC_PER_SEC >= 0) {
 			tp.tv_nsec = tp.tv_nsec - NSEC_PER_SEC;
 			tp.tv_sec++;