From: Kunwu Chan <[email protected]> Add the RCU_LOCKDEP_WARN and early-boot check that the Tree version gained, srcu_lock_sync() was already present.
Suggested-by: Zqiang <[email protected]> Signed-off-by: Kunwu Chan <[email protected]> Reviewed-by: Bradley Morgan <[email protected]> Reviewed-by: Joel Fernandes <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/srcutiny.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c index a31398def0b18..63a3f0a8bc53c 100644 --- a/kernel/rcu/srcutiny.c +++ b/kernel/rcu/srcutiny.c @@ -361,6 +361,12 @@ void synchronize_srcu_atomic(struct srcu_struct *ssp) 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; + if (IS_ENABLED(CONFIG_PREEMPTION)) synchronize_rcu(); // Needed for RCU Tasks Trace to imply RCU grace period. // And in Tiny RCU, it is near zero cost and doesn't block. -- 2.40.1
