Merge branch 'origin'

[pandora-kernel.git] / Documentation / RCU / checklist.txt

diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt
index e118a7c..49e27cc 100644 (file)
--- a/Documentation/RCU/checklist.txt
+++ b/Documentation/RCU/checklist.txt
@@ -177,3 +177,9 @@ over a rather long period of time, but improvements are always welcome!
 
        If you want to wait for some of these other things, you might
        instead need to use synchronize_irq() or synchronize_sched().
+
+12.    Any lock acquired by an RCU callback must be acquired elsewhere
+       with irq disabled, e.g., via spin_lock_irqsave().  Failing to
+       disable irq on a given acquisition of that lock will result in
+       deadlock as soon as the RCU callback happens to interrupt that
+       acquisition's critical section.