linux-kernel - [PATCH][RT] Trivial: Correctly dereference when clearing unused variable

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Message-Id: <1226092782.5685.11.camel@dd>
Date:	Fri, 07 Nov 2008 13:19:42 -0800
From:	Sven-Thorsten Dietrich <sven@...bigcorporation.com>
To:	RT Users List <linux-rt-users@...r.kernel.org>
Cc:	LKML <Linux-kernel@...r.kernel.org>, Tony Jones <tonyj@...e.de>
Subject: [PATCH][RT] Trivial: Correctly dereference when clearing unused
	variable



From: Sven-Thorsten Dietrich <sdietrich@...e.de>
Subject:  Correctly dereference flags when clearing unused variable.

Its probably unsafe to set the flags pointer to 0, since this will oops,
if it is dereferenced elsewhere for some odd reason. 

Signed-off-by: Sven-Thorsten Dietrich <sdietrich@...e.de>

---
 mm/page_alloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -170,7 +170,7 @@ static inline void __lock_cpu_pcp(unsign
 {
 #ifdef CONFIG_PREEMPT_RT
 	spin_lock(&__get_cpu_lock(pcp_locks, cpu));
-	flags = 0;
+	*flags = 0;
 #else
 	local_irq_save(*flags);
 #endif
@@ -180,7 +180,7 @@ static inline void lock_cpu_pcp(unsigned
 {
 #ifdef CONFIG_PREEMPT_RT
 	(void)get_cpu_var_locked(pcp_locks, this_cpu);
-	flags = 0;
+	*flags = 0;
 #else
 	local_irq_save(*flags);
 	*this_cpu = smp_processor_id();


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