|author||Paul E. McKenney <email@example.com>||2006-02-01 03:06:42 -0800|
|committer||Linus Torvalds <firstname.lastname@example.org>||2006-02-01 08:53:25 -0800|
[PATCH] RCU documentation fixes (January 2006 update)
Updates to in-tree RCU documentation based on comments over the past few months. Signed-off-by: "Paul E. McKenney" <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
Diffstat (limited to 'Documentation/RCU/checklist.txt')
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt
index e118a7c1a092..49e27cc19385 100644
@@ -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.