Re: 2.6.24-rc7-rt2

From: Esben Nielsen
Date: Mon Jan 21 2008 - 06:31:45 EST




On Wed, 16 Jan 2008, Steven Rostedt wrote:


On Wed, 16 Jan 2008, Steven Rostedt wrote:

We modified mcount now, and it is derived from an objdump of glibc. So
this is most definitely a "derived" work from glibc. But glibc is licensed
as LGPL, which IIRC allows for non GPL to link to it.

I personally could care less if we use EXPORT_SYMBOL or EXPORT_SYMBOL_GPL.
But I really want to do The Right Thing(tm). I'm not a lawyer and don't
claim that I know anything about the law, but I'm leaning towards the non
_GPL version because the code was from LGPL and not from strict GPL.

Sorry folks, I'm going to stick with the _GPL version. It doesn't mean
that you can't still load your nVidia module into -rt. I just means you
can't turn on function trace and then load it. Well, you might if you
don't compile the nVidia wrapper against it with function trace on.

The reason simply is to cover my butt. By limiting it to GPL, I'm fine.
Even if the original author didn't care. But by opening it up to external
prorietary modules, I may be considered infringing on the license.

So, unless I hear from a lawyer that is willing to back me up on a non
_GPL export publically, the mcount function will stay as an
EXPORT_SYMBOL_GPL.

Note: There is a definite reason for this change. The previous version
of mcount was written by Ingo Molnar, and he added the export. I've
changed mcount to be closer to the glibc code (which I derived it from),
so the change in EXPORT type is legitimate.

-- Steve


Please, tell what in the license forbids me to make a global replacement
EXPORT_SYMBOL_GPL -> EXPORT_SYMBOL and distribute the result?

For me, on the other hand, it is against the spirit of free software to actively make a block for people to do what ever they want with the code when they are only doing it to themselves. That includes loading non-GPL software into the kernel. The only thing they are not allowed to do is to
distribute it and in that way "hurt" other people.

Esben


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