K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2021-02-18T23:55:59.738134Z
K 7
svn:log
V 826
kenv: avoid sleepable alloc for integer tunables

Avoid performing a potentially-blocking malloc for kenv lookups that will only
perform non-destructive integer conversions on the returned buffer. Instead,
perform the strtoq() in-place with the kenv lock held.

While here, factor the logic around kenv_lock acquire and release into
kenv_acquire() and kenv_release(), and use these functions for some light
cleanup. Collapse getenv_string_buffer() into kern_getenv(), as the former
no longer has any other callers and the only additional task performed by
the latter is a WITNESS check that hasn't been useful since r362231.

PR:		248250
Reported by:	gbe
Reviewed by:	mjg
Tested by:	gbe
Differential Revision:	https://reviews.freebsd.org/D26010

Git Hash:   eefc7f388ab66a79f99a5f73236e9fbfc5312d4f
Git Author: jah@FreeBSD.org
END