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

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Message-ID: <CA+8MBbJnrhKmy5f_pbL8Ogi1ihM-51hfqCDY5gUQ1hkvw7p22Q@mail.gmail.com>
Date:	Mon, 2 Apr 2012 10:25:27 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Len Brown <lenb@...nel.org>
Cc:	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

>> +       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?

-Tony
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