Messages in this thread | | | From | Andy Lutomirski <> | Date | Thu, 4 Jun 2015 16:32:25 -0700 | Subject | Getting rid of i7300_idle's idle notifier? |
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AFAICT the sole purpose for the hideous x86_64 idle_notifier mess is to support i7300_idle. IMO this junk does not belong in IRQ handling, etc. Can we redo this to work in some kind of generic way?
I have no idea why it makes sense to twiddle I/O AT registers in the beginning of whatever IRQ wakes up the CPU.
Note that, if absolutely necessary, the ECX bit 0 MWAIT extension can be used to reliably execute code before handling interrupts that wake us from idle. That is, there could be a real cpuidle driver for that chip that does:
cli; poke ioat; mwait(ecx = 1); poke ioat; sti;
Or we could delete the driver entirely.
--Andy
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