linux-kernel - [PATCH] rcu/tree: Fix self wakeups for grace period kthread

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Message-Id: <1552038378-11166-1-git-send-email-neeraju@codeaurora.org>
Date:   Fri,  8 Mar 2019 15:16:18 +0530
From:   Neeraj Upadhyay <neeraju@...eaurora.org>
To:     paulmck@...ux.vnet.ibm.com, josh@...htriplett.org,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com
Cc:     linux-kernel@...r.kernel.org,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH] rcu/tree: Fix self wakeups for grace period kthread

Update the code to match the comment that self wakeup of
grace period kthread is allowed from interrupt handler, and
softirq handler, running in the grace period kthread's
context. Present code allows self wakeups from all
interrupt contexts - nmi, softirq and hardirq contexts.

Signed-off-by: Neeraj Upadhyay <neeraju@...eaurora.org>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index acd6ccf..57cac6d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1585,7 +1585,7 @@ static bool rcu_future_gp_cleanup(struct rcu_node *rnp)
 static void rcu_gp_kthread_wake(void)
 {
 	if ((current == rcu_state.gp_kthread &&
-	     !in_interrupt() && !in_serving_softirq()) ||
+	     !in_irq() && !in_serving_softirq()) ||
 	    !READ_ONCE(rcu_state.gp_flags) ||
 	    !rcu_state.gp_kthread)
 		return;
-- 
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