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| author | Paul E. McKenney | 2015-06-30 17:57:57 +0200 |
|---|---|---|
| committer | Paul E. McKenney | 2015-07-15 23:47:19 +0200 |
| commit | 5be5d1a11775fadc6104789fad72fae46dff348e (patch) | |
| tree | 9a6590a42b2615fc745759e1ac146471388d72c5 /kernel/rcu | |
| parent | rcutorture: Fix rcu_torture_cbflood() for callback-free RCU (diff) | |
| download | kernel-qcow2-linux-5be5d1a11775fadc6104789fad72fae46dff348e.tar.gz kernel-qcow2-linux-5be5d1a11775fadc6104789fad72fae46dff348e.tar.xz kernel-qcow2-linux-5be5d1a11775fadc6104789fad72fae46dff348e.zip | |
rcutorture: Add RCU-tasks qualifier to dereference
Although RCU-tasks isn't really designed to support rcu_dereference()
and list manipulation, that is how rcutorture tests it. Which means
that lockdep-RCU complains about the rcu_dereference_check() invocations
because RCU-tasks doesn't have read-side markers. This commit therefore
creates a torturing_tasks() to silence the lockdep-RCU complaints from
rcu_dereference_check() when RCU-tasks is being tortured.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index e0eda3c1b621..67b3f260720e 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -684,10 +684,20 @@ static struct rcu_torture_ops tasks_ops = { #define RCUTORTURE_TASKS_OPS &tasks_ops, +static bool __maybe_unused torturing_tasks(void) +{ + return cur_ops == &tasks_ops; +} + #else /* #ifdef CONFIG_TASKS_RCU */ #define RCUTORTURE_TASKS_OPS +static bool torturing_tasks(void) +{ + return false; +} + #endif /* #else #ifdef CONFIG_TASKS_RCU */ /* @@ -1087,7 +1097,8 @@ static void rcu_torture_timer(unsigned long unused) p = rcu_dereference_check(rcu_torture_current, rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || - srcu_read_lock_held(srcu_ctlp)); + srcu_read_lock_held(srcu_ctlp) || + torturing_tasks()); if (p == NULL) { /* Leave because rcu_torture_writer is not yet underway */ cur_ops->readunlock(idx); @@ -1161,7 +1172,8 @@ rcu_torture_reader(void *arg) p = rcu_dereference_check(rcu_torture_current, rcu_read_lock_bh_held() || rcu_read_lock_sched_held() || - srcu_read_lock_held(srcu_ctlp)); + srcu_read_lock_held(srcu_ctlp) || + torturing_tasks()); if (p == NULL) { /* Wait for rcu_torture_writer to get underway */ cur_ops->readunlock(idx); |