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Diffstat (limited to 'Documentation/RCU/checklist.txt')
| -rw-r--r-- | Documentation/RCU/checklist.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/RCU/checklist.txt b/Documentation/RCU/checklist.txt index e118a7c1a0928d..49e27cc1938538 100644 --- 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. |