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

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Message-ID: <20120402174557.GA9446@phenom.dumpdata.com>
Date:	Mon, 2 Apr 2012 13:45:57 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Tony Luck <tony.luck@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Boris Ostrovsky <boris.ostrovsky@....com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C
 states

On Mon, Apr 02, 2012 at 10:25:27AM -0700, Tony Luck wrote:
> >> +       while (1) {
> >> +
> >> +               if (cx->entry_method == ACPI_CSTATE_HALT)
> >> +                       halt();
> 
> What's the intent here?  I think that I can just set up a function pointer
> named "halt" on ia64 and point it to my cpu_halt() function (which looks
> for the deepest C-state, and then calls PAL to enter it. Is that equivalent
> to what the x86 "halt()" function does?

Or use the appropiate safe_halt() which should work on IA64.

> 
> -Tony
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