K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-09-12T13:51:43.798976Z
K 7
svn:log
V 561
kenv: assert that an empty static buffer passed in is "empty"

Garbage in the passed-in buffer can cause problems if any attempts to read
the kenv are inadvertently made between init_static_kenv and the first
kern_setenv -- assuming there is one.

This is cheap and easy, so do it. This also helps rule out some class of
bugs as one tries to debug; tunables fetch from the static environment up
until SI_SUB_KMEM + 1, and many of these buffers are global ~4k buffers that
rely on BSS clearing while others just grab a page of free memory and use it
(e.g. xen).

END