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Closes #251

Fixes:	54c93a0 ("dmabuf: Rewrite dma-fence subsystem")
Sponsored by:	Beckhoff Automation GmbH & Co. KG
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drm-kmod

The DRM drivers ported from Linux to FreeBSD using LinuxKPI

Contributing

Linux source code

Folders amd, drm, i915, radeon contain FreeBSD Makefiles for the driver modules.

Folder drivers contain source code from Linux, patched (minimally) to run on FreeBSD with LinuxKPI. Try to keep changes to the code to a minimum but if you have to patch it, leave the Linux source code intact like so:

#ifdef __linux__
...intact linux code...
#elif defined(__FreeBSD__)
bsd code
#endif

When updating and patching this code with code from Linux there are often merge conflicts where the code has been changed. If there are no markers it is difficult to know what code to keep and what to throw away.

Pull requests that do not follow this will not be accepted.

Unless obvious what your code does, please leave a comment to explain to fellow developers why you patched it. The source code is the documentation!

If the patch can be avoided by adding functionality to LinuxKPI, please consider the latter. Sooner or later, there will be more places where the functionality is used and having it in LinuxKPI mean we don't have to patch twice.

FreeBSD source code

Folders linuxkpi

Code style and rules same as FreeBSD kernel. No new code should be added there, all new linuxkpi functions should be added in FreeBSD base.