linux-kernel - Re: ACPI "_PDC" - acpi_processor_set_pdc()- execution regression

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Date:	Wed, 7 Dec 2011 22:01:24 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	wallak@...e.fr
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Lin Ming <ming.m.lin@...el.com>
Subject: Re: ACPI "_PDC" - acpi_processor_set_pdc()- execution regression - Linux-3.x

[+cc linux-acpi and Lin Ming]

On Wed, Dec 7, 2011 at 3:38 PM,  <wallak@...e.fr> wrote:
> We have a regression on the ACPI stack of the last linux kernel line 3.x (3.1.4,
> 3.2-rc4...). The ACPI "_PDC" chunk is not executed on some computers (e.g. Dell
> X300; the function acpi_processor_set_pdc() is not called). This issue yield to
> an uninitialized state of some ACPI variables.
>
> A patch is available below. This patch come back to the previous linux behavior,
> and works fine.
>
> Best Regards,
> Wallak.
>
> --- linux-3.1.4-mdf/drivers/acpi/processor_core.c.orig  2011-12-07
> 23:12:57.000000000 +0100
> +++ linux-3.1.4-mdf/drivers/acpi/processor_core.c       2011-12-07
> 23:13:39.000000000 +0100
> @@ -223,8 +223,8 @@
>        type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
>        cpuid = acpi_get_cpuid(handle, type, acpi_id);
>
> -       if (cpuid == -1)
> -               return false;
> +       if ((cpuid == -1) && (num_possible_cpus() > 1))
> +               return false;
>
>        return true;
>  }
> --
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