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

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> 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.

Other architectures don't use APCI - so this should just be localized to
x86 and ia64

-Tony
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