summaryrefslogtreecommitdiff
path: root/kernel/rcu
diff options
context:
space:
mode:
authorPaul E. McKenney <paulmck@kernel.org>2023-06-27 04:37:05 +0300
committerPaul E. McKenney <paulmck@kernel.org>2023-08-17 00:27:41 +0300
commit343640cb5b4ed349b3656ee4b100b36e2ae7e2da (patch)
tree2d07a650fd65be34bc87157838ef76db3243f42e /kernel/rcu
parented2b9e1b6d82c729b2757b449097f28f108b023b (diff)
downloadlinux-343640cb5b4ed349b3656ee4b100b36e2ae7e2da.tar.xz
rcu: Mark __rcu_irq_enter_check_tick() ->rcu_urgent_qs load
The rcu_request_urgent_qs_task() function does a cross-CPU store to ->rcu_urgent_qs, so this commit therefore marks the load in __rcu_irq_enter_check_tick() with READ_ONCE(). Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f788981272f8..cb1caefa8bd0 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -632,7 +632,7 @@ void __rcu_irq_enter_check_tick(void)
// prevents self-deadlock. So we can safely recheck under the lock.
// Note that the nohz_full state currently cannot change.
raw_spin_lock_rcu_node(rdp->mynode);
- if (rdp->rcu_urgent_qs && !rdp->rcu_forced_tick) {
+ if (READ_ONCE(rdp->rcu_urgent_qs) && !rdp->rcu_forced_tick) {
// A nohz_full CPU is in the kernel and RCU needs a
// quiescent state. Turn on the tick!
WRITE_ONCE(rdp->rcu_forced_tick, true);