linux-kernel - Re: [PATCH] ACPI: don't attempt to use hest_tab unless !acpi_pci

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Message-ID: <20110115123233.2727f871@queued.net>
Date:	Sat, 15 Jan 2011 12:32:33 -0800
From:	Andres Salomon <dilinger@...ued.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Huang Ying <ying.huang@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] ACPI: don't attempt to use hest_tab unless
 !acpi_pci_disabled

On Sat, 15 Jan 2011 14:01:18 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Saturday, January 15, 2011, Andres Salomon wrote:
> > On Fri, 14 Jan 2011 23:24:27 -0500 (EST)
> > Len Brown <lenb@...nel.org> wrote:
> > 
> > [...]
> > > > This patch causes apei_hest_parse to check both hest_disabled
> > > > and acpi_pci_disabled before continuing.  With it, the XO-1
> > > > boots properly.
> > > 
> > > The X0-1 has no ACPI support, and thus you are running
> > > with acpi_disabled=1, yes?
> > 
> > The XO-1 has no ACPI support, but ACPI support is enabled in the
> > kernel (as the XO-1.5 does have ACPI support, and the same kernel
> > is used between both) and I'm not passing any arguments to the
> > kernel regarding it. The kernel's ACPI code detects that it's not
> > there and disables it (the kernel message that's seen is "ACPI:
> > Interpreter disabled.")
> > 
> > This is what sets apci_pci_disabled to 1; I'm not doing it manually.
> 
> Hmm.  Does the appended patch help instead?

Nope.  acpi_hest_init returns immediately if acpi_disabled, and thus
never sets hest_disable.  You either need to set hest_disable, or
ensure apei_hest_parse checks more than just hest_disable.




> 
> Rafael
> 
> ---
>  drivers/acpi/pci_root.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/drivers/acpi/pci_root.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/pci_root.c
> +++ linux-2.6/drivers/acpi/pci_root.c
> @@ -631,11 +631,11 @@ static int acpi_pci_root_remove(struct a
>  
>  static int __init acpi_pci_root_init(void)
>  {
> +	acpi_hest_init();
> +
>  	if (acpi_pci_disabled)
>  		return 0;
>  
> -	acpi_hest_init();
> -
>  	pci_acpi_crs_quirks();
>  	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
>  		return -ENODEV;
--
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