Semantic error while accessing a function parameter with linux 2.6.29 ppc64

[Frank Ch. Eigler]

Sridhar Samudrala <samudrala.sridhar@gmail.com> writes:

> The following simple one line script is failing with a semantic error
> on linux 2.6.29 ppc64 .
> The same script works fine on linux 2.6.28.
> Is there any new config option that needs to be enabled with 2.6.29?
>
> stap -e 'probe kernel.function("tcp_transmit_skb") { printf("skb:%p \n",$sk=
> b) }'
>
> semantic error: not accessible at this address: identifier '$skb' [...]

http://sources.redhat.com/systemtap/wiki/TipContextVariables has
some advice about this general problem.


- FChE