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Date: Mon, 18 Mar 2002 17:22:16 -0700
From: Tom Rini <trini@kernel.crashing.org>
To: Jason Li <jli@extremenetworks.com>
Cc: Keith Owens <kaos@ocs.com.au>, linux-kernel@vger.kernel.org
Subject: Re: EXPORT_SYMBOL doesn't work
Message-ID: <20020319002216.GH3762@opus.bloom.county>
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On Mon, Mar 18, 2002 at 11:43:20AM -0800, Jason Li wrote:
> Tom Rini wrote:
> > 
> > On Mon, Mar 18, 2002 at 11:11:46AM -0800, Jason Li wrote:
> > > Keith Owens wrote:
> > > >
> > > > On Sun, 17 Mar 2002 22:25:16 -0800,
> > > > Jason Li <jli@extremenetworks.com> wrote:
> > > > >int (*fdbIoSwitchHook)(
> > > > >                           unsigned long arg0,
> > > > >                           unsigned long arg1,
> > > > >                           unsigned long arg2)=NULL;
> > > > >EXPORT_SYMBOL(fdbIoSwitchHook);
> > > > >gcc -D__KERNEL__ -I/home/jli/cvs2/exos/linux/include -Wall
> > > > >-Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer
> > > > >-fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2
> > > > >-march=i686    -c -o br_ioctl.o br_ioctl.c
> > > > >br_ioctl.c:26: warning: type defaults to `int' in declaration of
> > > > >`EXPORT_SYMBOL'
> > > >
> > > > #include <linux/module.h>
> > > >
> > > > Also add br_ioctl.o to export-objs in Makefile.
> > >
> > > Thanks alot. It works.
> > >
> > > Now another problem with versioning. It seems even after I have the
> > > following in my module c file the symbol generated is not versioned:
> > 
> > Backup your .config, run 'distclean' or 'mrproper' and try again.
> > 
> > --
> > Tom Rini (TR1265)
> > http://gate.crashing.org/~trini/
> 
> Just did a distclean. Now the inluce/linux/modules/netsym.ver has the
> fdbIoSwitchHook version info. 
> 
> Recompiled the module. Did a nm on the module, and saw the version info
> for the symbol. But when I dod insmod, it still complained about
> unresolved symbol fdbIoSwitchHook.
> 
> It seems now the version is different between the kernel and the module.
> Should I wait for the bzImage compilation to complete and install the
> new kernel?

There are annoying depenancies with modversions.  Basically the safe way
is that if you change any export (add/remove), you should do a
'distclean', recompile everything and switch to that.

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/