Re: Linux GPL and binary module exception clause?

[Valdis . Kletnieks]

On Fri, 05 Dec 2003 15:23:10 +1100, Peter Chubb said:

> As far as I know, interfacing to a published API doesn't infringe
> copyright.

Well, if the only thing in the .h files was #defines and structure definitions,
it would probably be a slam dunk to decide that, yes.

Here's the part where people's eyes glaze over:

% cd /usr/src/linux-2.6.0-test10-mm1
% find include -name '*.h' | xargs egrep 'static.*inline' | wc -l
   6288

That's 6,288 chances for you to #include GPL code and end up
with executable derived from it in *your* .o file, not the kernel's.

More to the point, look at include/linux/rwsem.h, and ask yourself
how to call down_read(), down_write(), up_read(), and up_write()
without getting little snippets of GPL all over your .o.  

And even if your module doesn't get screwed by that, there's a
few other equally dangerous inlines waiting to bite you on the posterior.

I seem to recall one of the little buggers was particularly nasty, because it
simply Would Not Work if not inlined, so compiling with -fno-inline wasn't an
option.  Unfortunately, I can't remember which it was - it was mentioned on
here a while ago when somebody's kernel failed to boot because a gcc 3.mumble
had broken inlining.....

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