diff options
| author | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-12-20 18:35:02 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-01-08 23:12:18 +0100 |
| commit | 353af9c9a866b07492b15a4efd18ec93123d3a1d (patch) | |
| tree | a514865e4134796a7a1b2cf1ae85e5c89e821eee /kernel/rcutree_plugin.h | |
| parent | Linux 3.8-rc2 (diff) | |
| download | linux-353af9c9a866b07492b15a4efd18ec93123d3a1d.tar.xz linux-353af9c9a866b07492b15a4efd18ec93123d3a1d.zip | |
rcu: Prevent soft-lockup complaints about no-CBs CPUs
The wait_event() at the head of the rcu_nocb_kthread() can result in
soft-lockup complaints if the CPU in question does not register RCU
callbacks for an extended period. This commit therefore changes
the wait_event() to a wait_event_interruptible().
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree_plugin.h')
| -rw-r--r-- | kernel/rcutree_plugin.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index f6e5ec2932b4..43dba2d798ac 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -2366,10 +2366,11 @@ static int rcu_nocb_kthread(void *arg) for (;;) { /* If not polling, wait for next batch of callbacks. */ if (!rcu_nocb_poll) - wait_event(rdp->nocb_wq, rdp->nocb_head); + wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head); list = ACCESS_ONCE(rdp->nocb_head); if (!list) { schedule_timeout_interruptible(1); + flush_signals(current); continue; } |