drm.h is included by user space programs (the mesa library). Is caddr_t a both a user space and kernel type or is it kernel only? Any types have to be both user and kernel space.
ok, sorry, pilot error. caddr_t is BSDism. so the proper way would be to either use (void *) as offset, or if an integer suits better uintptr_t (which is demanded by the single unix specification 2)
cheers simon
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