From 886e4e832d5969ff14a979985ed2fb297e278a15 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 20 Mar 2013 15:08:43 +1100
Subject: [PATCH] kernel-pidc-improve-flow-of-a-loop-inside-alloc_pidmap-fix

simplify code

Cc: Raphael S. Carvalho <raphael.scarv@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 kernel/pid.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 53a78d41331c..8147bdf22f36 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -183,15 +183,19 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
 				break;
 		}
 		if (likely(atomic_read(&map->nr_free))) {
-			do {
+			for ( ; ; ) {
 				if (!test_and_set_bit(offset, map->page)) {
 					atomic_dec(&map->nr_free);
 					set_last_pid(pid_ns, last, pid);
 					return pid;
 				}
 				offset = find_next_offset(map, offset);
-			} while (offset < BITS_PER_PAGE &&
-				(pid = mk_pid(pid_ns, map, offset)) < pid_max);
+				if (offset >= BITS_PER_PAGE)
+					break;
+				pid = mk_pid(pid_ns, map, offset);
+				if (pid >= pid_max)
+					break;
+			}
 		}
 		if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
 			++map;
-- 
2.39.5