From: Carsten Emde <C.Emde@osadl.org>
Date: Tue, 19 Jun 2012 08:43:16 +0000 (+0200)
Subject: rcu: Prevent uninitialized string in RCU CPU stall info
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c17e4d4437d8045a596d9f06c1558dc09e2b372;p=linux-beck.git

rcu: Prevent uninitialized string in RCU CPU stall info

An uninitialized string may be displayed at the end of the rcu_preempt
detected stall info such as

0: (1 GPs behind) idle=075/140000000000000/0 =8?^D=8?^D
                                             ^^^^^^^^^^
if CONFIG_RCU_FAST_NO_HZ is not defined.

This trivial patch clears the string in this case.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 4b6b17cdf66b..395cdd1e0634 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2224,6 +2224,7 @@ static void print_cpu_stall_fast_no_hz(char *cp, int cpu)
 
 static void print_cpu_stall_fast_no_hz(char *cp, int cpu)
 {
+	*cp = '\0';
 }
 
 #endif /* #else #ifdef CONFIG_RCU_FAST_NO_HZ */