Extract eventfilter declarations to sys/_eventfilter.h

This allows replacing "sys/eventfilter.h" includes with "sys/_eventfilter.h"
in other header files (e.g., sys/{bus,conf,cpu}.h) and reduces header
pollution substantially.

EVENTHANDLER_DECLARE and EVENTHANDLER_LIST_DECLAREs were moved out of .c
files into appropriate headers (e.g., sys/proc.h, powernv/opal.h).

As a side effect of reduced header pollution, many .c files and headers no
longer contain needed definitions.  The remainder of the patch addresses
adding appropriate includes to fix those files.

LOCK_DEBUG and LOCK_FILE_LINE_ARG are moved to sys/_lock.h, as required by
sys/mutex.h since r326106 (but silently protected by header pollution prior
to this change).

No functional change (intended).  Of course, any out of tree modules that
relied on header pollution for sys/eventhandler.h, sys/lock.h, or
sys/mutex.h inclusion need to be fixed.  __FreeBSD_version has been bumped.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/sys/watchdog.h b/sys/sys/watchdog.h
index 191456a4acf2..3728d742e4d1 100644
--- a/sys/sys/watchdog.h
+++ b/sys/sys/watchdog.h
@@ -104,7 +104,7 @@
 
 #ifdef _KERNEL
 
-#include <sys/eventhandler.h>
+#include <sys/_eventhandler.h>
 
 typedef void (*watchdog_fn)(void *, u_int, int *);