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Date:   Wed,  9 Jan 2019 13:45:27 -0800
From:   "Paul E. McKenney" <>
        "Paul E. McKenney" <>
Subject: [PATCH tip/core/rcu 1/2] srcu: Check for invalid idx argument in srcu_read_unlock()

The current SRCU implementation has an idx argument of zero or one,
and never anything else.  This commit therefore adds a WARN_ON_ONCE()
to complain if this restriction is violated.

Signed-off-by: Paul E. McKenney <>
 include/linux/srcu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index c614375cd264..33cf83b9bda8 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -223,6 +223,7 @@ srcu_read_lock_notrace(struct srcu_struct *ssp) __acquires(ssp)
 static inline void srcu_read_unlock(struct srcu_struct *ssp, int idx)
+	WARN_ON_ONCE(idx & ~0x1);
 	__srcu_read_unlock(ssp, idx);

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