[OpenAFS] Re: 1.4.2 client on RHEL5 beta 2

Jeffrey Hutzelman jhutz@cmu.edu
Wed, 06 Dec 2006 18:25:56 -0500

On Tuesday, November 21, 2006 04:16:51 PM +0100 Stephan Wiesand 
<Stephan.Wiesand@desy.de> wrote:

> But isn't loading such a module supposed to fail? Is it only in this
> special case that it doesn't, because of the "weak" definition of
> tasklist_lock in the AFS module and/or because of the fallback to
> rcu_read_lock?

It is, except that our reference is weak, so we can detect at runtime 
whether the symbol is available to us.  The kernel handles this case 
correctly; if a non-GPL module has a weak reference to a GPL-only symbol, 
the reference will be left unresolved, just as if the symbol were not 
present at all.

-- Jeff