It turns out the duplication is only mostly harmless.
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Authored by imp on Aug 23 2019, 5:37 PM.

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rS351447: It turns out the duplication is only mostly harmless.

Summary

While it worked with the kenrel, it wasn't working with the loader.
It failed to handle dependencies correctly. The reason for that is
that we never created a nvme module with the DRIVER_MODULE, but
instead a nvme_pci and nvme_ahci module. Create a real nvme module
that nvd can be dependent on so it can import the nvme symbols it
needs from there.

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Buildable 26045
Build 24590: arc lint + arc unit

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imp created this revision.Aug 23 2019, 5:37 PM

Harbormaster completed remote builds in B26045: Diff 61178.Aug 23 2019, 5:37 PM

This stuff is a bit too fragile in general, but if I fixed it, I would do a larger rototill by having MODUL_DEPEND only specify the version it is compiled against and then having modules advertise the versions they have compatible shims for (so instead of modules trying to guess a __FreeBSD_version range of kernels they are compatible with, the kernel would say which range of values it could handle modules from, and to handle things like virtual box and drm-kmod that want to use VM internals we might have a freebsd_vm "module" for which kernels advertise a smaller compatible range).

This revision is now accepted and ready to land.Aug 23 2019, 5:48 PM

In D21382#465307, @jhb wrote:

This stuff is a bit too fragile in general, but if I fixed it, I would do a larger rototill by having MODUL_DEPEND only specify the version it is compiled against and then having modules advertise the versions they have compatible shims for (so instead of modules trying to guess a __FreeBSD_version range of kernels they are compatible with, the kernel would say which range of values it could handle modules from, and to handle things like virtual box and drm-kmod that want to use VM internals we might have a freebsd_vm "module" for which kernels advertise a smaller compatible range).

We do need finer-grained dependency than we do now... This isn't quite the same thing... nvd has a... unique and special relationship with nvme that honestly should be a simple parent / child relationship for $REASONS to numerous to list here.

Closed by commit rS351447: It turns out the duplication is only mostly harmless. (authored by imp). · Explain WhyAug 23 2019, 10:53 PM

This revision was automatically updated to reflect the committed changes.

imp added a commit: rS351447: It turns out the duplication is only mostly harmless..