linux-kernel - Re: [PATCH] drm: drm_of.c: Using EXPORT_SYMBOL_GPL instead of EXPORT

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Message-ID: <a88a4b3a-a1c2-40a3-a393-cf91155d7f20@linux.dev>
Date: Wed, 1 May 2024 01:13:46 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: drm_of.c: Using EXPORT_SYMBOL_GPL instead of
 EXPORT_SYMBOL

Hi,


On 2024/4/30 17:26, Maxime Ripard wrote:
> Hi,
>
> On Tue, Apr 30, 2024 at 01:35:21AM +0800, Sui Jingfeng wrote:
>> Linux kernel puts strict limits on which functions and data structures
>> are available to loadable kernel modules; only those that have been
>> explicitly exported with EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL() are
>> accessible. In the case of EXPORT_SYMBOL_GPL(), only modules that declare
>> a GPL-compatible license will be able to see the symbol.
>>
>> Since the whole drm_of.c file is declared with GPL-2.0-only license, so
>> let us keep functions in that source file consistently.
> You're conflating two things: the license of the code itself (GPL2
> here), and the license of the users of the symbols exported in that
> file (anything).
>
> There's no relationship between the two, and you have to make an
> argument for changing the latter other than just because the license is
> GPL because, again, those are two different things.

Yeah, I think you might be correct.

It seems that it is valid to have EXPORT_SYMBOL() in GPL-2.0-only licensed file.


> Maxime

-- 
Best regards,
Sui