linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Date:	Mon, 28 Jan 2008 18:02:00 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pavel Machek <pavel@....cz>, "H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ian Campbell <ijc@...lion.org.uk>,
	Mika Penttil? <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

On Monday, 28 of January 2008, Ingo Molnar wrote:
> 
> > >   * driver might have split up a kernel 4MB mapping.
> > >   */
> > > -char __nosavedata swsusp_pg_dir[PAGE_SIZE]
> > > +char swsusp_pg_dir[PAGE_SIZE]
> 
> hm, random-qa found build breakage with this patch:
> 
>  arch/x86/kernel/built-in.o: In function `wakeup_start':
>  : undefined reference to `swsusp_pg_dir'
> 
> config attached.

I see.  CONFIG_HIBERNATION && CONFIG_ACPI -> CONFIG_ACPI_SLEEP
and the Makefile in arch/x86/kernel/acpi/ wants to build wakeup.S, which is
not necessary.  Hmm.

We can do a couple of things:
(1) make wakeup_$(BITS).o depend on CONFIG_SUSPEND (alone)
    This will build it if CONFIG_SUSPEND is set, but CONFIG_ACPI is not
    (still, that's consistent with the change in question).
(2) make wakeup_$(BITS).o depend on CONFIG_SUSPEND and CONFIG_ACPI
(3) define CONFIG_ACPI_SUSPEND depending on ACPI and SUSPEND and
    make wakeup_$(BITS).o as well as swsusp_pg_dir depend on that (most
    elegant)

Which one do you prefer?

In case you choose (3), please drop the patch and I'll send a new one to Len.

Thanks,
Rafael
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