Comment # 16 on bug 1224402 from Stefan Dirsch

Which warning do you mean exactly?

conftest.sh creates code snippets to figure out for specific functions, how
many and which kind of parameters are used in the kernel against the driver is
being built. This is needed due to all kind of backports done in downstream
kernels of distributions, so checking the kernel version doesn't work.

So maybe it's just overkill to fix such a warning? I mean if the detection
would be wrong because of this, probably the driver build would fail.