linux-kernel - Re: [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2)

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Message-Id: <200803232216.44627.rjw@sisk.pl>
Date:	Sun, 23 Mar 2008 22:16:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2)

On Friday, 21 of March 2008, Sam Ravnborg wrote:
> Hi Rafael.

Hi Sam,

> Is it possible to extend this in some way so we avoid the
> #ifdef stuff in the drivers?

Well, I'd love to do something like this.

> We could introduce a few special sections that we discard if
> PM is not in use.
> We have a reliable build time infrastructure to detect
> inconsistencies if needed.
> 
> Something like:
> #define __suspend     __section(.suspend.text)
> #define __suspenddata __section(.suspend.data)
> 
> #define __hibernate     __section(.hibernate.text)
> #define __hibernatedata __section(.hibernate.data)
> 
> A few more tricks will be needed when we assign the functon pointers.
> We have __devexit_p(*) and we may use something similar.

Unfortunately, I have a little experience with linkers and I don't think I'll
be able to do anything like this in a reasonable time without any help.

Thanks,
Rafael
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