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Subject[PATCH tip/core/rcu 13/24] rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_kick_kthreads
Date
From: "Paul E. McKenney" <paulmck@kernel.org>

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>
---
kernel/rcu/tree_stall.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index b5d3b47..a1780a6 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -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();
--
2.9.5
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