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

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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: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-06-23 18:04:45 -07:00
parent a2b354b995
commit fe63b723cc
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree_stall.h
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@ -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();