linux-ext4 - Re: [PATCH 2/3] lib: improve the performance of memcpy and memmove of the general version

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Date:	Sat, 04 Sep 2010 08:59:02 -0400
From:	Calvin Walton <calvin.walton@...il.com>
To:	Florian Weimer <fweimer@....de>
Cc:	miaox@...fujitsu.com, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Btrfs <linux-btrfs@...r.kernel.org>,
	Linux Ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/3] lib: improve the performance of memcpy and memmove
 of the general version

On Fri, 2010-09-03 at 11:03 +0000, Florian Weimer wrote:
> * Miao Xie:
> 
> >  EXPORT_SYMBOL(memcpy);
> 
> I think you need to change that to EXPORT_SYMBOL_GPL, because the code
> is now licensed under the GPL, and not the GPL plus kernel exceptions
> (whatever they are, but they undoubtly exist), unlike the original
> implementation.

I wouldn't think so - the intent of EXPORT_SYMBOL_GPL is to mark symbols
that make it obvious that a module was derived from the Linux kernel, as
opposed to some sort of generic driver that was just ported to a new
interface. (It's not foolproof, it's more of a warning to developers.)

If you think of it this way, memcpy is a function defined in the C
standard, there's absolutely nothing Linux-specific about using it.

Of course, IANAL; and you should probably grab some more opinions on the
matter.

-- 
Calvin Walton <calvin.walton@...il.com>

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