diff options
| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-01-14 10:19:20 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-03-26 14:40:13 -0700 |
| commit | 7ac1907c9e7ba5f80d3c298fe9d2dbf620566a49 (patch) | |
| tree | 0f81ccafa0a1cee54a7e53dc42cff00edfb088cc /kernel/rcu/tree_stall.h | |
| parent | e23344c2ca42d0083596bb39964675bef00ad691 (diff) | |
rcu: Move irq-disabled stall-warning checking to tree_stall.h
The rcu_iw_handler() function's sole purpose in life is to indicate
whether a stalled CPU had interrupts disabled, so it belongs in
kernel/rcu/tree_stall.h. This commit therefore makes that move,
clarifying its header comment while in the area.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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 |