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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-06-23 18:04:45 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-08-24 18:36:07 -0700 |
| commit | fe63b723cc7ca3a91ea91274e0f2cba29452b3fa (patch) | |
| tree | aab109d4dd32f14442ef1a483466e2a6fa99027f /kernel/rcu/tree_stall.h | |
| parent | a2b354b9950bb859d8d959f951dda26725b041fb (diff) | |
| download | linux-fe63b723cc7ca3a91ea91274e0f2cba29452b3fa.tar.gz | |
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: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_stall.h')
| -rw-r--r-- | kernel/rcu/tree_stall.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index b5d3b4794db4..a1780a621b5e 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(); |