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srcu: Check for invalid idx argument in srcu_read_unlock()

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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 <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-11-30 10:06:46 -08:00
parent 7a968bb26a
commit c8ca1aa774
1 changed files with 1 additions and 0 deletions
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include/linux/srcu.h
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@ -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)
__releases(ssp)
{
WARN_ON_ONCE(idx & ~0x1);
rcu_lock_release(&(ssp)->dep_map);
__srcu_read_unlock(ssp, idx);
}