lualoader: Create a module blacklist, add DRM modules to it

This is a step in the process of easing migration into the new world order
of DRM drivers. Strongly encourage users towards loading DRM modules via
rc.conf(5) instead of loader.conf(5) by failing the load from loader(8).
Users so inclined may wipe out the blacklist via module_blacklist="" in
loader.conf(5), and it is expected that these modules will eventually be
removed from the blacklist. They may still be loaded as dependencies of
other modules or explicitly via the loader prompt, but this should not be a
major problem.

Approved by:	re (rgrimes)
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D16914

1 files changed, 7 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 607b16ff6d35..07e4e2153c58 100644
--- a/UPDATING
+++ b/UPDATING
@@ -31,6 +31,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20181006:
+	The legacy DRM modules and drivers have now been added to the loader's
+	module blacklist, in favor of loading them with kld_list in rc.conf(5).
+	The module blacklist may be overridden with the loader.conf(5)
+	'module_blacklist' variable, but loading them via rc.conf(5) is strongly
+	encouraged.
+
 20181002:
 	The cam(4) based nda(4) driver will be used over nvd(4) by default on
 	powerpc64. You may set 'options NVME_USE_NVD=1' in your kernel conf or