Re: [Xenomai-help] Unknown symbol xnshadow_send_sig

[Philippe Gerum <rpm@xenomai.org>]

Klaas Gadeyne wrote:
> Hi,
> 
> When using the xenomai-v2.1.x branch (tested with r1058, and a
> snapshot from a couple of days ago, using the "Champagne" version of
> the nucleus IIRC), I get the above error while trying to load the
> xeno_native kernel module.  Relevant data is below:
> 
> [kgad@domain.hid /lib/modules/2.6.16adeos-ipipe-1.2-05]$
>  lsmod | grep xeno_nucleus
> xeno_nucleus          222112  0
> [kgad@domain.hid /lib/modules/2.6.16adeos-ipipe-1.2-05]$
>  sudo modprobe xeno_native
> FATAL: Error inserting xeno_native
>  (/lib/modules/2.6.16adeos-ipipe-1.2-05/kernel/kernel/xenomai/skins/native/xeno_native.ko): 
> 
>  Unknown symbol in module, or unknown parameter (see dmesg)
> [kgad@domain.hid /lib/modules/2.6.16adeos-ipipe-1.2-05]$
>  dmesg | tail -n 5
> Xenomai: hal/x86 started.
> I-pipe: Domain IShield registered.
> Xenomai: real-time nucleus v2.1.1 (Trundrumbalind) loaded.
> xeno_native: Unknown symbol xnshadow_send_sig
> xeno_native: Unknown symbol xnshadow_send_sig
> 
> [kgad@domain.hid /lib/modules/2.6.16adeos-ipipe-1.2-05]$
>  nm --defined-only
>  /lib/modules/2.6.16adeos-ipipe-1.2-05/kernel/kernel/xenomai/nucleus/xeno_nucleus.ko 
> 
>  | grep xnshadow_send_sig
> 0000e050 T xnshadow_send_sig
> [kgad@domain.hid /lib/modules/2.6.16adeos-ipipe-1.2-05]$
>  nm
>  /lib/modules/2.6.16adeos-ipipe-1.2-05/kernel/kernel/xenomai/skins/native/xeno_native.ko 
> 
>  | grep xnshadow_send_sig
>          U xnshadow_send_sig
> 
> 
> The signatures of the function seem to match to and I don't get the
> error when using xenomai-trunk with 2.6.16adeos-ipipe-1.3-01.
> 

Missing export inthe v2.1 branch which has been fixed in the v2.2 one, 
the patch below fixes it. A work-around is to build the native interface 
statically into the kernel, and not as a module.

--- ksrc/nucleus/shadow.c	(revision 1000)
+++ ksrc/nucleus/shadow.c	(working copy)
@@ -1898,4 +1898,5 @@
  EXPORT_SYMBOL(xnshadow_unregister_interface);
  EXPORT_SYMBOL(xnshadow_wait_barrier);
  EXPORT_SYMBOL(xnshadow_suspend);
+EXPORT_SYMBOL(xnshadow_send_sig);
  EXPORT_SYMBOL(nkgkptd);


-- 

Philippe.