locktorture: Track time of last ->writeunlock()
This commit adds a last_lock_release variable that tracks the time of the last ->writeunlock() call, which allows easier diagnosing of lock hangs when using a kernel debugger. Acked-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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