linux-kernel - Re: [RFC] x86/pci: Mark pci_root

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Message-ID: <20181108235134.GH41183@google.com>
Date:   Thu, 8 Nov 2018 17:51:35 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Zubin Mithra <zsm@...omium.org>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        hch@...radead.org, groeck@...omium.org, keescook@...omium.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [RFC] x86/pci: Mark pci_root_ops as const

Hi Zubin,

On Thu, Nov 08, 2018 at 09:11:15AM -0800, Zubin Mithra wrote:
> pci_root_ops is only written to from within intel_mid_pci_init. This
> is linked in only when CONFIG_X86_INTEL_MID is set. If not for this,
> pci_root_ops could be marked as const.
> 
> Fix this by replacing pci_root_ops usage with pci_root_ops_ptr. If
> CONFIG_X86_INTEL_MID is set, pci_root_ops_ptr will be set to
> intel_mid_pci_ops inside intel_mid_pci_init.
> 
> Introduce pci_acpi_set_ops for intel_mid_pci_init to set
> acpi_pci_root_ops.pci_ops.
> 
> This also means that intel_mid_pci_ops cannot be freed after init, hence
> remove __initconst.
> 
> Signed-off-by: Zubin Mithra <zsm@...omium.org>
> ---
>  arch/x86/include/asm/pci_x86.h |  4 +++-
>  arch/x86/pci/acpi.c            |  5 +++++
>  arch/x86/pci/common.c          |  5 +++--
>  arch/x86/pci/intel_mid_pci.c   |  5 +++--
>  drivers/pci/access.c           |  4 ++--
>  drivers/pci/probe.c            |  4 ++--
>  include/linux/pci-acpi.h       |  2 +-
>  include/linux/pci.h            | 11 ++++++-----
>  8 files changed, 25 insertions(+), 15 deletions(-)

Can you:

  - Split this into an x86 patch and a PCI core patch (if possible)?
  - Make the same fixes for other arches?

Bjorn