>On Tue, 2002-10-22 at 09:02, Corey Minyard wrote:
>
>
>
>>I looked, and the rcu code relys on turning off interrupts to avoid
>>preemption. So it won't work.
>>
>>
>
>At least on the variant of RCU that is in 2.5, the RCU code does the
>read side by disabling preemption. Nothing else.
>
In 2.5.44, stock from kernel.org, rcu_process_callbacks() calls
local_irq_disable(). Is that just preemption disabling, now?
>The write side is the same with or without preemption - wait until all
>readers are quiescent, change the copy, etc.
>
>But anyhow, disabling interrupts should not affect NMIs, no?
>
You are correct. disabling preemption or interrupts has no effect on NMIs.
-Corey
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