Commit fe63b723 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_kick_kthreads 



Given that sysfs can change the value of rcu_kick_kthreads at any time,
this commit adds a READ_ONCE() to the sole access to that variable.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent a2b354b9

kernel/rcu/tree_stall.h

+2 −2
Original line number Diff line number Diff line
@@ -158,7 +158,7 @@ static void rcu_stall_kick_kthreads(void) 
{

	unsigned long j;



	if (!rcu_kick_kthreads)

	if (!READ_ONCE(rcu_kick_kthreads))

		return;

	j = READ_ONCE(rcu_state.jiffies_kick_kthreads);

	if (time_after(jiffies, j) && rcu_state.gp_kthread &&
@@ -580,7 +580,7 @@ static void check_cpu_stall(struct rcu_data *rdp) 
	unsigned long js;

	struct rcu_node *rnp;



	if ((rcu_stall_is_suppressed() && !rcu_kick_kthreads) ||

	if ((rcu_stall_is_suppressed() && !READ_ONCE(rcu_kick_kthreads)) ||

	    !rcu_gp_in_progress())

		return;

	rcu_stall_kick_kthreads();

CRA Git | Maintained and supported by SUSTech CRA and CCSE