[Bug 205690] [psm] [patch]: Add support for Elantech trackpads

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205690

--- Comment #46 from Oleksandr Tymoshenko <gonzo at FreeBSD.org> ---
(In reply to Guilherme Salazar from comment #42)

Hi Guilherme,

WITNESS and INVARIANTS are two kernel options that add additional checks to
detect problems with locking and some inconsistencies in internal subsystem
states. These checks affect performance so they're not enabled in release
kernels, only on -CURRENT. It's a good idea to test patches with
WITNESS/INVARIANTS enabled to catch bugs like lock order reversal early instead
of going through full debugging.

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