linux-kernel - Re: [RFC PATCH 09/33] Add start-of-day setup hooks to subarch

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Date:	Thu, 20 Jul 2006 09:27:16 -0400
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Keir Fraser <Keir.Fraser@...cam.ac.uk>
CC:	Adrian Bunk <bunk@...sta.de>, Ian Pratt <ian.pratt@...source.com>,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [RFC PATCH 09/33] Add start-of-day setup hooks to subarch

Keir Fraser wrote:
>>> +struct shared_info *HYPERVISOR_shared_info = (struct shared_info 
>>> *)empty_zero_page;
>>> +EXPORT_SYMBOL(HYPERVISOR_shared_info);
>>> ...
>>
>> EXPORT_SYMBOL_GPL?
>
> Interrupt-control macros (local_irq_enable/disable and friends) used 
> this symbol, so GPLing it made non-GPL modules fail. We made a bunch 
> of the macros proper functions so this may no longer be the case.

Given that this is just a page exported from the hypervisor, it doesn't 
make much sense to impose a GPL requirement on this symbol (to put it 
another way, this is more part of the Xen ABI than the Linux API, so 
Linux can't make much claim to it).

    J
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