Messages in this thread | | | Date | Tue, 22 Oct 2002 13:08:49 -0500 | From | Corey Minyard <> | Subject | Re: [PATCH] NMI request/release |
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Robert Love wrote:
>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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