linux kernel scope access question

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http://www.linuxforums.org – I have two netfilter kernel modules (xt_RQS.c, xt_RQD.c) both include the same header file with a data structure in it. Does both kernel modules use the same data structures or do they use separate ones (in normal C programming I know that but I'm not sure about the kernel scopes). If I want to use one data structure how can I do that (export? - concurrency issues left aside)? Greetings and thanks jb (HowTos)