No functional change intended.

Reviewed by:	olce, kib, emaste
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D53062

Sponsored by:	Klara, Inc.

Implement the Linux inotify system calls using the native implementation
in vfs_inotify.c.

PR:		240874
Reviewed by:	brooks
MFC after:	3 months
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D50761

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by:	brooks, imp, kib
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D51005

Switch to using sys/stdarg.h for va_list type and va_* builtins.

Make an attempt to insert the include in a sensible place.  Where
style(9) was followed this is easy, where it was ignored, aim for the
first block of sys/*.h headers and don't get too fussy or try to fix
other style bugs.

Reviewed by:	imp
Exp-run by:	antoine (PR 286274)
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1595

This is a value for TLS base that would be explicitly set by user.
It is forced into the fsbase register on entry to signal handler, making
TLS in the handler usable even if userspace uses segmentation.

Reported and tested:    Alex S <iwtcex@gmail.com>
Tested by:	pho
Reviewed by:	olce
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D50482