linux-kernel - Re: [PATCH v3 00/14] PCI: let the core manage slot names

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Message-ID: <48D9FE92.1070505@jp.fujitsu.com>
Date:	Wed, 24 Sep 2008 17:47:14 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Alex Chiang <achiang@...com>
CC:	jbarnes@...tuousgeek.org, kristen.c.accardi@...el.com,
	matthew@....cx, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/14] PCI: let the core manage slot names

Hi Alex-san,

Thank you for the updated patches.
I'll review and test them. Please give me several days.

Thanks,
Kenji Kaneshige


Alex Chiang wrote:
> Hi Jesse, Kenji, et al,
> 
> This is v3 of the series that implements a series of changes
> that allows the PCI core to manage slot names, rather than
> individual hotplug drivers.
> 
> v2 -> v3:
> 	- incorporate Willy's code review comments
> 	- fix possible memory leak, pointed out by Rolf Eike Beer
> 	- make false name collision detection work for empty slots
> 	- add 'dup_slots' module_param to fakephp to help debug all this ;)
> 
> v1 -> v2:
> 	- fix possible false name collisions
> 
> This series applies against linux-next. I've tested this by loading
> pci_slot and various hotplug drivers to ensure that the hotplug drivers
> can successfully override the pci_slot names.
> 
> I'm including the previous explanation/justification to remind
> folks of the raison d'etre for this patchset.
> 
> Thanks.
> 
> /ac
> 
> There are several benefits to this approach:
> 
> 	1) The core can prevent duplicate slot names on systems
> 	with broken firmware.
> 
> 	2) Since the kobject core keeps a copy of the slot name,
> 	there is no need for each driver to manage a separate
> 	copy, especially since the core can rename slots from
> 	underneath drivers. We save runtime memory by only
> 	referencing the kobject name.
> 
> 	2.a) The PCI hotplug core doesn't need its own reference
> 	for slot name either.
> 
> 	3) Individual hotplug drivers become just a little bit
> 	simpler by pushing as many kzalloc() calls for 'name'
> 	down into the PCI core as possible.
> 
> ---
> 
> Alex Chiang (14):
>       PCI Hotplug: fakephp: add duplicate slot name debugging
>       PCI: Hotplug core: remove 'name'
>       PCI: shcphp: remove 'name' parameter
>       PCI: SGI Hotplug: stop managing bss_hotplug_slot->name
>       PCI: rpaphp: stop managing hotplug_slot->name
>       PCI: pciehp: remove 'name' parameter
>       PCI: ibmphp: stop managing hotplug_slot->name
>       PCI: fakephp: remove 'name' parameter
>       PCI: cpqphp: stop managing hotplug_slot->name
>       PCI: cpci_hotplug: stop managing hotplug_slot->name
>       PCI: acpiphp: remove 'name' parameter
>       PCI, PCI Hotplug: introduce slot_name helpers
>       PCI: prevent duplicate slot names
>       PCI Hotplug core: add 'name' param pci_hp_register interface
> 
> 
>  drivers/pci/hotplug/acpiphp.h           |    9 +-
>  drivers/pci/hotplug/acpiphp_core.c      |   32 +++---
>  drivers/pci/hotplug/cpci_hotplug.h      |    6 +
>  drivers/pci/hotplug/cpci_hotplug_core.c |   74 +++++---------
>  drivers/pci/hotplug/cpci_hotplug_pci.c  |    4 -
>  drivers/pci/hotplug/cpqphp.h            |   13 +-
>  drivers/pci/hotplug/cpqphp_core.c       |   42 ++++----
>  drivers/pci/hotplug/fakephp.c           |   25 +++--
>  drivers/pci/hotplug/ibmphp.h            |    5 -
>  drivers/pci/hotplug/ibmphp_ebda.c       |   19 +---
>  drivers/pci/hotplug/pci_hotplug_core.c  |   62 ++++++------
>  drivers/pci/hotplug/pciehp.h            |    9 +-
>  drivers/pci/hotplug/pciehp_core.c       |   41 +++-----
>  drivers/pci/hotplug/pciehp_ctrl.c       |   53 +++++-----
>  drivers/pci/hotplug/pciehp_hpc.c        |    1 
>  drivers/pci/hotplug/rpaphp.h            |   10 +-
>  drivers/pci/hotplug/rpaphp_core.c       |    6 +
>  drivers/pci/hotplug/rpaphp_pci.c        |    4 -
>  drivers/pci/hotplug/rpaphp_slot.c       |   26 ++---
>  drivers/pci/hotplug/sgi_hotplug.c       |   18 +--
>  drivers/pci/hotplug/shpchp.h            |    9 +-
>  drivers/pci/hotplug/shpchp_core.c       |   42 +++-----
>  drivers/pci/hotplug/shpchp_ctrl.c       |   48 ++++-----
>  drivers/pci/slot.c                      |  167 +++++++++++++++++++++++--------
>  include/linux/pci.h                     |    9 +-
>  include/linux/pci_hotplug.h             |   13 ++
>  26 files changed, 401 insertions(+), 346 deletions(-)
> 
> --
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> 


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