linux-kernel - Re: [Resend with Ack][PATCH v1] PCI: allow acpiphp to handle PCIe ports without native PCIe hotplug capability

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Message-ID: <CAErSpo5dV+ZPRmOBmdmTf1hEPXvqtXyTyNj4m2nDFEkKi5NmGQ@mail.gmail.com>
Date:	Mon, 9 Jul 2012 11:05:14 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <jiang.liu@...wei.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, Don Dutile <ddutile@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Keping Chen <chenkeping@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jiang Liu <liuj97@...il.com>
Subject: Re: [Resend with Ack][PATCH v1] PCI: allow acpiphp to handle PCIe
 ports without native PCIe hotplug capability

On Mon, Jul 9, 2012 at 4:05 AM, Jiang Liu <jiang.liu@...wei.com> wrote:
> Hi Bjorn and Yinghai,
>         What's the policy to export a symbol by EXPORT_SYMBOL()
> or EXPORT_SYMBOL_GPL()? I know the legal difference, but don't
> know when I should mark a symbol as GPL.

>From Documentation/DocBook/kernel-hacking.tmpl,

    EXPORT_SYMBOL_GPL implies that the function is considered
    an internal implementation issue, and not really an interface.

So I use EXPORT_SYMBOL_GPL unless I'm willing to support the symbol as
an interface indefinitely.

Bjorn
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