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

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Message-ID: <5365BF06.7050108@huawei.com>
Date:	Sun, 4 May 2014 12:16:06 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.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

> 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.
> 

Hi Bjorn, sorry forgot to cc pci list, will resend the v2 patchset with
some new description for new pci_is_bridge().

> 
>> 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(-)
>>
>>
> 
> .
> 


-- 
Thanks!
Yijing

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