Merge remote branch 'wireless-next/master' into ath6kl-next

[cascardo/linux.git] / Documentation / RCU / checklist.txt

diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt
index 0c134f8..bff2d8b 100644 (file)
--- a/Documentation/RCU/checklist.txt
+++ b/Documentation/RCU/checklist.txt
@@ -328,6 +328,12 @@ over a rather long period of time, but improvements are always welcome!
        RCU rather than SRCU, because RCU is almost always faster and
        easier to use than is SRCU.
 
+       If you need to enter your read-side critical section in a
+       hardirq or exception handler, and then exit that same read-side
+       critical section in the task that was interrupted, then you need
+       to srcu_read_lock_raw() and srcu_read_unlock_raw(), which avoid
+       the lockdep checking that would otherwise this practice illegal.
+
        Also unlike other forms of RCU, explicit initialization
        and cleanup is required via init_srcu_struct() and
        cleanup_srcu_struct().  These are passed a "struct srcu_struct"