Re: [PATCH v2 1/2] PCI: Add 'nodomains' boot option, and pci_domains_supported global

[Jeff Garzik <jeff@garzik.org>]

Jeff Garzik wrote:
> * Introduce pci_domains_supported global, hardcoded to zero if
>   !CONFIG_PCI_DOMAINS.
> 
> * Introduce 'nodomains' boot option, which clears pci_domains_supported
>   on platforms that enable it by default (x86, x86-64, and others when
>   they are converted to use this).
> 
> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
> ---
> Revised per Andi's comments, and split into two patches.
> 
> As found in jgarzik/misc-2.6.git#ALL and jgarzik/misc-2.6.git#pciseg.
> 
>  Documentation/kernel-parameters.txt |    2 ++
>  drivers/pci/pci.c                   |   13 +++++++++++++
>  include/linux/pci.h                 |    7 +++++--
>  3 files changed, 20 insertions(+), 2 deletions(-)

As a note, if this wasn't obvious, this was not implemented in 
x86-specific code because I think other arches can/should be able to 
hook into this.

The default !CONFIG_PCI_DOMAINS implementation continues to work for all 
such arches.