linux-kernel - [PATCH] rcu: update: Check rcu_bh_lock_map state in rcu_read_lock_bh

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Message-Id: <1624363521-19702-1-git-send-email-neeraju@codeaurora.org>
Date:   Tue, 22 Jun 2021 17:35:21 +0530
From:   Neeraj Upadhyay <neeraju@...eaurora.org>
To:     paulmck@...nel.org, josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        urezki@...il.com, frederic@...nel.org,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH] rcu: update: Check rcu_bh_lock_map state in rcu_read_lock_bh_held

In addition to irq and softirq state, check rcu_bh_lock_map
state, to decide whether RCU bh lock is held.

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

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index c21b38c..d416f1c 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -333,7 +333,7 @@ int rcu_read_lock_bh_held(void)
 
 	if (rcu_read_lock_held_common(&ret))
 		return ret;
-	return in_softirq() || irqs_disabled();
+	return lock_is_held(&rcu_bh_lock_map) || in_softirq() || irqs_disabled();
 }
 EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
 
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