If rcu_kick_kthreads is set, and gp is in progress, check_cpu_stall()
does checks to figure out whether jiffies is past rsp->jiffies_stall,
doing ordered accesses to avoid any false positives for new grace
period initialization after a sufficiently large idle period. This
extra processing can be skipped if rcu_cpu_stall_suppress is set.

Fixes: 8c7c4829a81c ("rcu: Awaken grace-period kthread if too long since FQS")
Signed-off-by: Neeraj Upadhyay <neer...@codeaurora.org>
 kernel/rcu/tree.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 51d4c3a..91b7552 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1562,10 +1562,13 @@ static void check_cpu_stall(struct rcu_state *rsp, 
struct rcu_data *rdp)
        unsigned long js;
        struct rcu_node *rnp;
-       if ((rcu_cpu_stall_suppress && !rcu_kick_kthreads) ||
-           !rcu_gp_in_progress(rsp))
+       if (!rcu_gp_in_progress(rsp))
+       if (rcu_cpu_stall_suppress)
+               return;
        j = jiffies;
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