Re: [PATCH][RFC] __init and friends support for loadable modules

[Rusty Russell <rusty@rustcorp.com.au>]

On Thu, 09 May 2002 00:02:07 +1000
Keith Owens <kaos@ocs.com.au> wrote:

> On Wed, 8 May 2002 14:29:33 +0400, 
> Andrey Panin <pazke@orbita1.ru> wrote:
> >attached patch adds support for	freeing .init sections of loadable modules
> >after init_module() function exits. Modutils have support for this since 19=
> >98,
> >but kernel support didn't exist.
> 
> The main reason I have not done this myself is the interaction between
> freeing code areas and the exception and unwind tables.  When you free
> code, you should remove or nullify the related unwind and exception
> entries.  Another module could be loaded into the area that used to
> contain init code and it would then be mapped by the first module's
> tables, oops.

Excellent catch, Keith.  I missed this in my current implementation, and
will have to patch the exception tables in the init release callback.  I
also get around this because I allow archs to refuse to have separate
init and core sections if they want.

BTW, I just got ppc64 in-kernel relocations working.  I am starting on
ia64, in the theory that if you can do ia64, you can do anything.

Cheers,
Rusty.
-- 
   there are those who do and those who hang on and you don't see too
   many doers quoting their contemporaries.  -- Larry McVoy