From: Kunwu Chan <[email protected]> Add the lockdep annotation, same-type SRCU nesting warning, and early-boot check used by __synchronize_srcu().
Suggested-by: Zqiang <[email protected]> Signed-off-by: Kunwu Chan <[email protected]> Reviewed-by: Joel Fernandes <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/srcutree.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 6e37d53b412e1..7890f7c7c2ee7 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -2122,6 +2122,14 @@ void synchronize_srcu_atomic(struct srcu_struct *ssp) unsigned long rdm0, rdm1; unsigned long unlocks0, unlocks1; + srcu_lock_sync(&ssp->dep_map); + + RCU_LOCKDEP_WARN(lockdep_is_held(ssp), + "Illegal synchronize_srcu_atomic() in same-type SRCU read-side critical section"); + + if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE) + return; + // Initialize. Either init_srcu_struct() was invoked or // DEFINE_SRCU() or similar was used. Therefore, no allocation // will be done here. -- 2.40.1
