[Bug 283429] [vfs] add (debug) option to avoid initialization of system time from filesystem last mounted time when no rtc found

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283429

--- Comment #9 from Sulev-Madis Silber <bugs-freebsd-org916@ketas.si.pri.ee> ---
i had this impression that it takes all the fses ever found by kernel!

like at mountroot time, kernel is all up and can mount rootfs from any fs it
knows. so any local fs

if it only does this for rootfs, why the loop and selection of largest
timestamp? unless that feature is legacy from actual unix times and perhaps
served some other purpose back then. ok it says mounted, i now looked again.
but still wtf. how do you get timestamp on devfs anyway. if you claim only 2 of
them could exist. does it also do nfs somehow?

as for purpose, now 10 years later i wonder if maybe more waits would have
helped. but if that sounds reasonable feature, why not implement it. however
the loader approach, aren't there people who have actually implemented boot
flag before so i don't have totally wing it? :/

in theory we could commit it as hidden var like

hw.userspace_allow_phys_counter

one match in commit log
one match in src
two matches in google, where one is commit in commit mailing list and one is me
actually using it

but then we can't take it out again of course

but seeing that noone has needed this for like ever in decades and decades, or
at least haven't publicly told so, nor did anybody care in #bsdmips nor in
current mailing list, maybe it could wait more

until either i or somebody else does it

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