linux-kernel - Re: [PATCH 00/13] Refactor pci_is

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Message-ID: <CAErSpo4fa=fmajhxGA7PRm42S1fS2wV_7w+EWaVh_qiawRAQxA@mail.gmail.com>
Date:	Wed, 30 Apr 2014 10:29:52 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 00/13] Refactor pci_is_brdige() to simplify code

On Fri, Apr 25, 2014 at 3:18 AM, Yijing Wang <wangyijing@...wei.com> wrote:
> This patchset rename the current pci_is_bridge() to pci_has_subordinate(),
> and introduce a new pci_is_bridge() which determine pci bridge by check
> dev->hdr_type. The new one is more accurate. PCIe Spec define the pci
> device is a bridge by the dev->hdr_type = 0x01 || 0x02.

This needs to be posted to the linux-pci list.  The fact that it
wasn't means it's not in patchwork, so it's not on my to-do list.

Currently we have one interface: pci_is_bridge().

After your series, we would have two interfaces: pci_is_bridge() and
pci_has_subordinate().  Presumably, both are used, and you should
explain how you decided which to use at each place.

I assume the difference is that the old pci_is_bridge() is true for a
bridge that has a subordinate bus.  The new pci_is_bridge() is true
for any bridge, even if there is no subordinate bus.  When do we even
have a bridge with no subordinate bus?  This is the sort of stuff you
need to explain so we know why we should apply these patches.

Bjorn

> Yijing Wang (13):
>   PCI: rename pci_is_bridge() to pci_has_subordinate()
>   PCI: Introduce new pci_is_bridge() helper function
>   PCI: Use new pci_is_bridge() to simplify code
>   x86/PCI: Use new pci_is_bridge() to simplify code
>   IA64/PCI: Use new pci_is_bridge() to simplify code
>   powerpc/PCI: Use new pci_is_bridge() to simplify code
>   sparc/PCI: Use new pci_is_bridge() to simplify code
>   PCI, rpaphp: Use new pci_is_bridge() to simplify code
>   PCI, shpchp: Use new pci_is_bridge() to simplify code
>   PCI, cpcihp: Use new pci_is_bridge() to simplify code
>   PCI, acpiphp: Use new pci_is_bridge() to simplify code
>   PCI, pcmcia: Use new pci_is_bridge() to simplify code
>   PCI, pciehp: Use new pci_is_bridge() to simplify code
>
>  arch/ia64/pci/fixup.c                  |    4 +---
>  arch/powerpc/kernel/pci-hotplug.c      |    3 +--
>  arch/powerpc/kernel/pci_of_scan.c      |    3 +--
>  arch/sparc/kernel/pci.c                |    3 +--
>  arch/x86/pci/fixup.c                   |    4 +---
>  drivers/pci/hotplug/acpiphp_glue.c     |    3 +--
>  drivers/pci/hotplug/cpci_hotplug_pci.c |    3 +--
>  drivers/pci/hotplug/pciehp_pci.c       |    3 +--
>  drivers/pci/hotplug/rpadlpar_core.c    |    3 +--
>  drivers/pci/hotplug/shpchp_pci.c       |    3 +--
>  drivers/pci/pci-acpi.c                 |    8 +-------
>  drivers/pci/pci-driver.c               |    8 ++++----
>  drivers/pci/pci.h                      |    2 +-
>  drivers/pci/probe.c                    |    3 +--
>  drivers/pci/setup-bus.c                |    4 +---
>  drivers/pcmcia/cardbus.c               |    3 +--
>  include/linux/pci.h                    |    6 ++++++
>  17 files changed, 25 insertions(+), 41 deletions(-)
>
>
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