linux-kernel - Re: APM shutdown oops (Re: [stable] [patch 09/12] Fix SMP poweroff hangs)

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Date:	Fri, 12 Oct 2007 14:05:07 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin <spaceman__spiff@....net>, Greg KH <greg@...ah.com>,
	Olof Johansson <olof@...om.net>, Greg KH <gregkh@...e.de>,
	Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Domenico Andreoli <cavokz@...il.com>,
	Mark Lord <mlord@...ox.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, akpm@...ux-foundation.org,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	alan@...rguk.ukuu.org.uk, BDFL <volkerdi@...ckware.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: APM shutdown oops (Re: [stable] [patch 09/12] Fix SMP poweroff hangs)

On Friday, 12 October 2007 01:27, Adrian Bunk wrote:
> On Thu, Oct 11, 2007 at 02:42:01PM -0400, Jeff Garzik wrote:
> > Linus Torvalds wrote:
> >> On Wed, 10 Oct 2007, Kevin wrote:
> >>> The last kernel I used was 6.2.22 the "dmesg" the file is attached:
> >>>
> >>> dmesg 2.6.22 line 158 >  apm: overridden by ACPI.
> >>>
> >>> dmesg, APM on, has no line > apm: overridden by ACPI.
> >> Ok, this is the real reason. The APM code does:
> >>         if (PM_IS_ACTIVE()) {
> >>                 printk(KERN_NOTICE "apm: overridden by ACPI.\n");
> >>                 apm_info.disabled = 1;
> >>                 return -ENODEV;
> >>         }
> >> and in previous kernels that would notice that you have ACPI enabled, and 
> >> APM gets shut out, and you never see your buggy APM BIOS.
> >> In 2.6.23, this apparently doesn't happen for some reason.
> >> And I think I see the problem: it's a config change. You don't have 
> >> PM_LEGACY enabled. Your config file diff shows:
> >> 	-CONFIG_PM_LEGACY=y
> >> 	+# CONFIG_PM_LEGACY is not set
> >> I suspect we should make CONFIG_APM either depend on, or select, 
> >> PM_LEGACY. But as far as I can see, nothing has actually changed in this 
> >> area in the kernel, and this bug has been there before - just your config 
> >> change made it appear. Rafael? Stephen? Opinions? I'd think that making 
> >> APM depend on CONFIG_PM_LEGACY is the right thing to do these days..
> >
> > Speaking as the author of
> >
> > 	[PATCH] move pm_register/etc. to CONFIG_PM_LEGACY, pm_legacy.h
> >
> > I agree.  arch/i386/kernel/apm.c clearly requires include/linux/pm_legacy.h 
> > and the legacy PM API.
> >
> > I would vote for a dependency rather than select, but don't have any strong 
> > feelings on the matter...
> 
> It should be a select since a dependency would make it needlessly hard 
> for kconfig users to find the APM option.

Well, my experience with selects is such that I'd rather avoid them in the
future, if possible ...

Greetings,
Rafael
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