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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-01-12 14:18:11 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-01-14 04:58:08 -0800
commitb24efdfdf679cf9b05947c531971905fc727dd40 (patch)
tree06d8532819315ad0aa84d8ff64a1d35901b018fb /kernel
parentc072a388d59a1d48e36864d0e66f42d71745be1c (diff)
downloadlinux-b24efdfdf679cf9b05947c531971905fc727dd40.tar.bz2
rcu: avoid pointless blocked-task warnings
If the RCU callback-processing kthread has nothing to do, it parks in a wait_event(). If RCU remains idle for more than two minutes, the kernel complains about this. This commit changes from wait_event() to wait_event_interruptible() to prevent the kernel from complaining just because RCU is idle. Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Thomas Weber <weber@corscience.de> Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcutiny.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 034493724749..0c343b9a46d5 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -189,7 +189,8 @@ static int rcu_kthread(void *arg)
unsigned long flags;
for (;;) {
- wait_event(rcu_kthread_wq, have_rcu_kthread_work != 0);
+ wait_event_interruptible(rcu_kthread_wq,
+ have_rcu_kthread_work != 0);
morework = rcu_boost();
local_irq_save(flags);
work = have_rcu_kthread_work;