linux-kernel - Re: [PATCH -mm 1/2] kexec jump -v11: kexec jump

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Message-Id: <1213581141.7179.6.camel@caritas-dev.intel.com>
Date:	Mon, 16 Jun 2008 09:52:21 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.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 1/2] kexec jump -v11: kexec jump

On Fri, 2008-06-13 at 14:00 -0400, Vivek Goyal wrote:
[...]
> Ok, I found that in my config CONFIG_HIBERNATION was not enabled. After
> enabling CONFIG_HIBERNATION, both suspend to disk and kjump started
> working.
> 
> Does that mean there is some dependency on code under CONFIG_HIBERNATION.
> If yes, I think this dependency should be resolved during compile time.
> May be addtional config option (CONFIG_KEXEC_JUMP), which also selects
> the CONFIG_HIBERNATION automatically etc...

Yes. kexec jump need to put devices into quiescent state and save
devices state into memory, which is implemented by calling hibernation
function: device_suspend(PMSG_FREEZE), whose implementation depends on 
CONFIG_HIBERNATION.

So, I will add CONFIG_KEXEC_JUMP and select CONFIG_HIBERNATION
automatically.

Best Regards,
Huang Ying

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