linux-kernel - Re: [PATCH] ACPI: don't walk tables if ACPI was disabled

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Message-Id: <200806240922.22300.bjorn.helgaas@hp.com>
Date:	Tue, 24 Jun 2008 09:22:21 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Len Brown" <lenb@...nel.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	"Zhao Yakui" <yakui.zhao@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Alexey Starikovskiy" <astarikovskiy@...e.de>,
	"Yinghai Lu" <yhlu.kernel@...il.com>
Subject: Re: [PATCH] ACPI: don't walk tables if ACPI was disabled

On Tuesday 24 June 2008 5:52:55 am Vegard Nossum wrote:
> On 6/24/08, Ingo Molnar <mingo@...e.hu> wrote:
> > i havent seen the warning reappear with your fix after thousands of
> > bootups - so i guess we can consider it fixed.
> >
> > Len, please consider the patch below. (it's in tip/out-of-tree)
>
> No, please don't :-)
>
> It fixes your particular case (the acpi_rtc_init() hunk of the patch),
> but the acpi_walk_namespace() part should be changed to a WARN(). But
> that is likely to cause a lot of "spurious" reports, so the other acpi
> drivers should be fixed as well.
>
> I was waiting for Len to reply, but maybe I can submit the proper fix too.

I haven't looked into the acpi_walk_namespace() question.

But I did look at the acpi_rtc_init() stuff, and I have to say it
looks like a really round-about way to accomplish this.  I'd rather
just fold in the FADT accesses directly into cmos_do_probe() and
dispense with the stuff in drivers/acpi/glue.c.  I'm working on a
couple patches along this line, but it will take me a few days to
finish up.

Bjorn
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