linux-kernel - Re: [RFC PATCH v2, part 2 01/18] PCI: introduce hotplug-safe PCI bus iterators

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Message-ID: <CAE9FiQU89jOx_-EFZnKsETEDDbmEmDctmYraNENAwt14FkCvXQ@mail.gmail.com>
Date:	Tue, 14 May 2013 11:56:23 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2, part 2 01/18] PCI: introduce hotplug-safe PCI bus iterators

On Tue, May 14, 2013 at 9:51 AM, Jiang Liu <liuj97@...il.com> wrote:
> Introduce hotplug-safe PCI bus iterators as below, which hold a
> reference on the returned PCI bus object.
> bool pci_bus_exists(int domain, int busnr);
> struct pci_bus *pci_get_bus(int domain, int busnr);
> struct pci_bus *pci_get_next_bus(struct pci_bus *from);
> struct pci_bus *pci_get_next_root_bus(struct pci_bus *from);
> #define for_each_pci_bus(b) for (b = NULL; (b = pci_get_next_bus(b)); )
> #define for_each_pci_root_bus(b)  \
>                 for (b = NULL; (b = pci_get_next_root_bus(b)); )
>
> The long-term goal is to remove hotplug-unsafe pci_find_bus(),
> pci_find_next_bus() and the global pci_root_buses list.
>
> These new interfaces may be a littler slower than existing interfaces,
> but it should be acceptable because they are not used on hot paths.
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Yinghai Lu <yinghai@...nel.org>
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