diff options
| -rw-r--r-- | Documentation/RCU/checklist.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/RCU/checklist.rst b/Documentation/RCU/checklist.rst index 2d42998a89a6..98a622f77248 100644 --- a/Documentation/RCU/checklist.rst +++ b/Documentation/RCU/checklist.rst @@ -68,7 +68,8 @@ over a rather long period of time, but improvements are always welcome! rcu_read_lock_sched(), or by the appropriate update-side lock. Explicit disabling of preemption (preempt_disable(), for example) can serve as rcu_read_lock_sched(), but is less readable and - prevents lockdep from detecting locking issues. + prevents lockdep from detecting locking issues. Acquiring a + spinlock also enters an RCU read-side critical section. Please note that you *cannot* rely on code known to be built only in non-preemptible kernels. Such code can and will break, @@ -444,7 +445,7 @@ over a rather long period of time, but improvements are always welcome! real-time workloads than is synchronize_rcu_expedited(). It is also permissible to sleep in RCU Tasks Trace read-side - critical, which are delimited by rcu_read_lock_trace() and + critical section, which are delimited by rcu_read_lock_trace() and rcu_read_unlock_trace(). However, this is a specialized flavor of RCU, and you should not use it without first checking with its current users. In most cases, you should instead use SRCU. |