kernel: Remove explicit dependencies on <sys/malloc.h> in headers.

All except <net/if_var.h> for now, it needs decoupling in drm first.
* Include <sys/malloc.h> in foo.c if they have kmalloc()/kfr

kernel: Remove explicit dependencies on <sys/malloc.h> in headers.

All except <net/if_var.h> for now, it needs decoupling in drm first.
* Include <sys/malloc.h> in foo.c if they have kmalloc()/kfree() calls.
* Consistently check if MALLOC_DECLARE was declared before.
* <sys/mountctl.h>: include <sys/thread.h> for _KERNEL_STRUCTURES too
since the "struct journal" embeds "struct thread".
* <sys/tty.h>: Only two kernel sources makes use of M_TTYS.
* <sys/socketvar2.h>: Make it kernel only header.

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kernel: Move us to using M_NOWAIT and M_WAITOK for mbuf functions.

The main reason is that our having to use the MB_WAIT and MB_DONTWAIT
flags was a recurring issue when porting drivers from FreeBSD

kernel: Move us to using M_NOWAIT and M_WAITOK for mbuf functions.

The main reason is that our having to use the MB_WAIT and MB_DONTWAIT
flags was a recurring issue when porting drivers from FreeBSD because
it tended to get forgotten and the code would compile anyway with the
wrong constants. And since MB_WAIT and MB_DONTWAIT ended up as ocflags
for an objcache_get() or objcache_reclaimlist call (which use M_WAITOK
and M_NOWAIT), it was just one big converting back and forth with some
sanitization in between.

This commit allows M_* again for the mbuf functions and keeps the
sanitizing as it was before: when M_WAITOK is among the passed flags,
objcache functions will be called with M_WAITOK and when it is absent,
they will be called with M_NOWAIT. All other flags are scrubbed by the
MB_OCFLAG() macro which does the same as the former MBTOM().

Approved-by: dillon

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kernel: Add three missing ')', two of them in (yet) unused code.

kernel: Remove NULL checks after kmalloc() with M_WAITOK.

netgraph7: convert lockmgr locks into mutexes.

kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.

Requested-by: Nuno Antunes

Netgraph port from FreeBSD - initial porting work

* Use relative #include's as appropriate so the code doesn't
dig into the original netgraph/ directory.

* Move FBSDID's and add DragonFly ids.

*

Netgraph port from FreeBSD - initial porting work

* Use relative #include's as appropriate so the code doesn't
dig into the original netgraph/ directory.

* Move FBSDID's and add DragonFly ids.

* Fix improper uses of M_NOWAIT.

* Fix uses of M_NOWAIT which should be MB_DONTWAIT and vise-versa
(also forward to Julian).

* Add a dragonfly.h compatibility header.

* NOTE: m_tag_alloc() in DFly takes MB_ flags.

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Vendor import of netgraph from FreeBSD-current 20080626