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| author | Zqiang <qiang1.zhang@intel.com> | 2022-11-09 15:36:38 +0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-12-01 15:49:12 -0800 |
| commit | 51f5f78a4f804aeb73cf12a7cbba6e5198abd908 (patch) | |
| tree | dd26106fc99481083dffc714542e17214fcd2c10 | |
| parent | 0cd7e350abc40eed5d3b60292dc102f700c88388 (diff) | |
| download | linux-51f5f78a4f804aeb73cf12a7cbba6e5198abd908.tar.bz2 | |
srcu: Make Tiny synchronize_srcu() check for readers
This commit adds lockdep checks for illegal use of synchronize_srcu()
within same-type SRCU read-side critical sections and within normal
RCU read-side critical sections. It also makes synchronize_srcu()
be a no-op during early boot.
These changes bring Tiny synchronize_srcu() into line with both Tree
synchronize_srcu() and Tiny synchronize_rcu().
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: John Ogness <john.ogness@linutronix.de>
| -rw-r--r-- | kernel/rcu/srcutiny.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c index 33adafdad261..b12fb0cec44d 100644 --- a/kernel/rcu/srcutiny.c +++ b/kernel/rcu/srcutiny.c @@ -197,6 +197,16 @@ void synchronize_srcu(struct srcu_struct *ssp) { struct rcu_synchronize rs; + RCU_LOCKDEP_WARN(lockdep_is_held(ssp) || + lock_is_held(&rcu_bh_lock_map) || + lock_is_held(&rcu_lock_map) || + lock_is_held(&rcu_sched_lock_map), + "Illegal synchronize_srcu() in same-type SRCU (or in RCU) read-side critical section"); + + if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE) + return; + + might_sleep(); init_rcu_head_on_stack(&rs.head); init_completion(&rs.completion); call_srcu(ssp, &rs.head, wakeme_after_rcu); |