diff mbox

[tip/core/rcu,01/17] rcu: Fix detection of abruptly-ending stall

Message ID 1340379312-6684-1-git-send-email-paulmck@linux.vnet.ibm.com
State Accepted
Commit 285fe29481d865ae381ad3924c80894e6968c2d8
Headers show

Commit Message

Paul E. McKenney June 22, 2012, 3:34 p.m. UTC 
From: "Paul E. McKenney" <paul.mckenney@linaro.org>

The code that attempts to identify stalls that end just as we detect
them is broken by both flavors of initialization failure.  This commit
therefore properly initializes and computes the count of the number
of reasons why the RCU grace period is stalled.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---
 kernel/rcutree.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 0da7b88..0f04480 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -732,7 +732,7 @@  static void print_other_cpu_stall(struct rcu_state *rsp)
 	int cpu;
 	long delta;
 	unsigned long flags;
-	int ndetected;
+	int ndetected = 0;
 	struct rcu_node *rnp = rcu_get_root(rsp);
 
 	/* Only let one CPU complain about others per time interval. */
@@ -773,7 +773,7 @@  static void print_other_cpu_stall(struct rcu_state *rsp)
 	 */
 	rnp = rcu_get_root(rsp);
 	raw_spin_lock_irqsave(&rnp->lock, flags);
-	ndetected = rcu_print_task_stall(rnp);
+	ndetected += rcu_print_task_stall(rnp);
 	raw_spin_unlock_irqrestore(&rnp->lock, flags);
 
 	print_cpu_stall_info_end();