You are not permitted to link to GPL only symbols if your module is not
GPL, the error there is telling you you are trying to do exactly that:
FATAL: modpost: GPL-incompatible module test.ko uses GPL-only symbol
'xen_dma_ops'
Either one has to work with the upstream contributor to relax that
symbol to EXPORT_SYMBOL, or you need to find an alternative.
If you do not expect your device to encounter systems running on XEN you
could likely short circut this by defining xen_dma_ops as NULL. before
you include that header:
#define xen_dma_ops NULL
Though if you do that you should also check for xen_initial_domain() in
your init (if you can call that) and abort if true.
That said, it seems rather unfortuanate that those ops being _GPL
renders he whole DMA infratructure useless. It is worth approaching
whoever committed that and asking for that symbol to be relaxed.
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https://bugs.launchpad.net/bugs/1348442
Title:
Unable to compile proprietary kernel driver under ARM64 Ubuntu 14.04
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