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

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Message-ID: <CA+8MBbKv25Uu3fJeBhyj5cQvB6FN+KqgnP67UGhwvF+p635g7w@mail.gmail.com>
Date:	Mon, 2 Apr 2012 11:02:44 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Boris Ostrovsky <boris.ostrovsky@....com>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states

> 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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