diff options
Diffstat (limited to 'kernel/rcu/tree_stall.h')
| -rw-r--r-- | kernel/rcu/tree_stall.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index 03ed47883d8a..526e223e41ce 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -139,6 +139,26 @@ static void rcu_stall_kick_kthreads(void) } } +/* + * Handler for the irq_work request posted about halfway into the RCU CPU + * stall timeout, and used to detect excessive irq disabling. Set state + * appropriately, but just complain if there is unexpected state on entry. + */ +static void rcu_iw_handler(struct irq_work *iwp) +{ + struct rcu_data *rdp; + struct rcu_node *rnp; + + rdp = container_of(iwp, struct rcu_data, rcu_iw); + rnp = rdp->mynode; + raw_spin_lock_rcu_node(rnp); + if (!WARN_ON_ONCE(!rdp->rcu_iw_pending)) { + rdp->rcu_iw_gp_seq = rnp->gp_seq; + rdp->rcu_iw_pending = false; + } + raw_spin_unlock_rcu_node(rnp); +} + ////////////////////////////////////////////////////////////////////////////// // // Printing RCU CPU stall warnings |