Re: __put_task_struct unresolved when being used in modules

[Christoph Hellwig <hch@infradead.org>]

On Wed, Oct 13, 2004 at 12:17:54PM +0200, Thomas Spatzier wrote:
> 
> 
> 
> 
> I have a module that keeps a reference to a task_struct and uses
> get_task_struct and put_task_struct to increment/decrement the
> task_struct's ref count.
> Function __put_task_struct defined in kernel/fork.c does not have
> an associated EXPORT_SYMBOL , so I get an unresolved symbol
> error.
> Is there a reason why __put_task_struct is not exported? Otherwise,
> I would just add the missing EXPORT_SYMBOL. There are a number
> of EXPORT_SYMBOLs already defined in fork.c anyway.

In general module shouldn't deal with task reference counts.  If we decide
you have a legitimate reason for doing this from a module after a review here
on lkml we could add an EXPORT_SYMBOL_GPL at the same time your module gets
merged.

p.s. this is really becoming a FAQ ;-)