Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states

[Boris Ostrovsky <boris.ostrovsky@xxxxxxx>]

On 04/02/12 14:02, Tony Luck wrote:
> > x86 halt() causes processor to go to C1 state (which is often not the
> > deepest). But other than that it seems similar to what you are describing.
>
> OK - then Konrad's suggestion of using "safe_halt()" here rather than
> "halt()" would work for ia64.

I originally didn't want to use safe_halt() because the CPU will wake up 
on an unmasked HW interrupt unlike halt(). But I guess we are not 
supposed to get any such interrupts when we are off-lining a CPU so 
safe_halt() should be OK.

Thanks.
-boris

--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html