linux-kernel - Re: [PATCH -mm] kexec jump -v9

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Message-ID: <1210902902.23707.164.camel@caritas-dev.intel.com>
Date:	Fri, 16 May 2008 09:55:02 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Vivek Goyal <vgoyal@...hat.com>, Pavel Machek <pavel@....cz>,
	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -mm] kexec jump -v9

On Thu, 2008-05-15 at 18:35 -0700, Eric W. Biederman wrote:
> Vivek Goyal <vgoyal@...hat.com> writes:
> 
> > ioapic_suspend() is not putting APICs in Legacy mode and that's why
> > we are seeing the issue. It only saves the IOAPIC routing table entries
> > and these entries are restored during ioapic_resume().
> >
> > But I think somebody has to put APICs in legacy mode for normal 
> > hibernation also. Not sure who does it. May be BIOS, so that during
> > resume, second kernel can get the timer interrupts.
> 
> I doubt anything cares in the suspend to ram case. There should just
> be a small BIOS trampoline to get back to linux when the processor
> restarts.  And you don't need interrupts for any of that. 

As far as I know, in suspend to ram, interrupt is used as waking up
event, such as, keyboard interrupt.

Best Regards,
Huang Ying
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