Jeffrey Hutzelman <[EMAIL PROTECTED]> writes:
> On Tuesday, November 21, 2006 04:16:51 PM +0100 Stephan Wiesand
> <[EMAIL PROTECTED]> 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.
One way to solve this is to make a compile-time check for the symbol
and if it fails there then we don't run the runtime check, we ifdef
it out. That way the build wont fail in modpost.
> -- Jeff
-derek
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
[EMAIL PROTECTED] PGP key available
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