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From: Bjorn Helgaas <bhelgaas@google.com>
Date: Mon, 9 Jul 2012 11:05:14 -0600
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Subject: Re: [Resend with Ack][PATCH v1] PCI: allow acpiphp to handle PCIe
 ports without native PCIe hotplug capability
To: Jiang Liu <jiang.liu@huawei.com>
Cc: Yinghai Lu <yinghai@kernel.org>, Don Dutile <ddutile@redhat.com>,
        "Rafael J. Wysocki" <rjw@sisk.pl>,
        Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>,
        Taku Izumi <izumi.taku@jp.fujitsu.com>,
        Yijing Wang <wangyijing@huawei.com>,
        Keping Chen <chenkeping@huawei.com>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, Jiang Liu <liuj97@gmail.com>
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On Mon, Jul 9, 2012 at 4:05 AM, Jiang Liu <jiang.liu@huawei.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