Messages in this thread | | | Date | Thu, 23 Feb 2006 23:04:02 -0500 (EST) | From | Alan Stern <> | Subject | Re: [PATCH] The idle notifier chain should be atomic |
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On Fri, 24 Feb 2006, Andi Kleen wrote:
> On Friday 24 February 2006 04:24, Alan Stern wrote: > > > In do_IRQ() there's a call to exit_idle(), which calls __exit_idle(), > > which runs the idle_notifier call chain. Surely you're not saying that we > > can do a down_read() in this pathway? > > No, but not because it's in an interrupt but because sleeping in the idle > task is illegal.
Well, either reason is sufficient justification for making idle_notifier an atomic chain.
> > And actually the chain's type doesn't seem to make much difference, since > > at the moment there's nothing in the vanilla kernel that registers for the > > idle_notifier chain. > > Will come eventually.
Will that be just for x86_64 or for all architectures?
Alan Stern
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