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srcu: Make Tiny synchronize_srcu() check for readers

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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>
This commit is contained in:
Zqiang 2022-11-09 15:36:38 +08:00 • committed by Paul E. McKenney
parent 0cd7e350ab
commit 51f5f78a4f
1 changed files with 10 additions and 0 deletions
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10
kernel/rcu/srcutiny.c
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@ -197,6 +197,16 @@ void synchronize_srcu(struct srcu_struct *ssp)
{ {
struct rcu_synchronize rs; 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_rcu_head_on_stack(&rs.head);
init_completion(&rs.completion); init_completion(&rs.completion);
call_srcu(ssp, &rs.head, wakeme_after_rcu); call_srcu(ssp, &rs.head, wakeme_after_rcu);