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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-01-04 13:30:33 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:03:23 -0800 |
| commit | fe15d706cfc1cb321dbe2329b04b5ca185edff60 (patch) | |
| tree | bec14ab52167f4f0210e8c207c93922c8270402f /kernel/rcutree_plugin.h | |
| parent | 18fec7d8758dd416904da205375e6fa667defc80 (diff) | |
| download | talos-obmc-linux-fe15d706cfc1cb321dbe2329b04b5ca185edff60.tar.gz talos-obmc-linux-fe15d706cfc1cb321dbe2329b04b5ca185edff60.zip | |
rcu: Add lockdep-RCU checks for simple self-deadlock
It is illegal to have a grace period within a same-flavor RCU read-side
critical section, so this commit adds lockdep-RCU checks to splat when
such abuse is encountered. This commit does not detect more elaborate
RCU deadlock situations. These situations might be a job for lockdep
enhancements.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree_plugin.h')
| -rw-r--r-- | kernel/rcutree_plugin.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 8bb35d73e1f9..3680b6b35bf3 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -688,6 +688,10 @@ EXPORT_SYMBOL_GPL(call_rcu); */ void synchronize_rcu(void) { + rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map) && + !lock_is_held(&rcu_lock_map) && + !lock_is_held(&rcu_sched_lock_map), + "Illegal synchronize_rcu() in RCU read-side critical section"); if (!rcu_scheduler_active) return; wait_rcu_gp(call_rcu); |
