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[tip/core/rcu,15/17] Prevent uninitialized string in RCU stall info

Message ID 1340379312-6684-15-git-send-email-paulmck@linux.vnet.ibm.com
State Accepted
Commit 1c17e4d4437d8045a596d9f06c1558dc09e2b372
Headers show

Commit Message

Paul E. McKenney June 22, 2012, 3:35 p.m. UTC 
From: Carsten Emde <C.Emde@osadl.org>

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>
---
 kernel/rcutree_plugin.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
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Patch

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index d806186..321ba89 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2205,6 +2205,7 @@  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 */