[Xenomai] how to bring gpio to user space

Wed May 2 10:42:00 CEST 2018

HI Community
I try to register simple rtdm gpio driver

but get the error EEXIST  ? could you explain what is wrong or missing ?
and what daes it mean  "invalid opcode: 0000 [#1] SMP" ?

[ 1415.642644] gpio Driver Init
[ 1415.642646] gpio TRY register Driver 
[ 1415.642881] err number = -17
[ 1415.642885] err EEXIST = -17
[ 1415.642922] ------------[ cut here ]------------
[ 1415.643010] kernel BUG at mm/slub.c:3873!
[ 1415.643066] invalid opcode: 0000 [#1] SMP

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