wsdisplay(4): Use C99 initializer for usl_syncops.

Avoid sketchy function pointer cast while here.

Move proc_lock into the data segment. It was dynamically allocated because
at the time we had mutex_obj_alloc() but not __cacheline_aligned.

- Use kmem_intr_{alloc,free}, because on time out we need to free from an
interrupt context.
- Remove parens from returns and useless casts from void.

use sizeof(*var) instead of sizeof(type)

use kmem, don't check for allocation failure with KM_SLEEP

to garnish, dust with _KERNEL_OPT

fix a bunch of _IO() ioctl()s to actually work on LP64/BE
( the data pointer is abused to pass an integer, we get a pointer to it so
we need to deref it to something the same size as a pointer to g

fix a bunch of _IO() ioctl()s to actually work on LP64/BE
( the data pointer is abused to pass an integer, we get a pointer to it so
we need to deref it to something the same size as a pointer to get the
correct value )
now the PCVT compat code ( which is used for VT switching in and out of X )
works on sparc64

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Remove pfind() and pgfind(), fix locking in various broken uses of these.
Rename real routines to proc_find() and pgrp_find(), remove PFIND_* flags
and have consistent behaviour. Provide proc_find_r

Remove pfind() and pgfind(), fix locking in various broken uses of these.
Rename real routines to proc_find() and pgrp_find(), remove PFIND_* flags
and have consistent behaviour. Provide proc_find_raw() for special cases.
Fix memory leak in sysctl_proc_corename().

COMPAT_LINUX: rework ptrace() locking, minimise differences between
different versions per-arch.

Note: while this change adds some formal cosmetics for COMPAT_DARWIN and
COMPAT_IRIX - locking there is utterly broken (for ages).

Fixes PR/43176.

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Don't call usl_sync_check_sig from an interrupt context. Call it only if waitok.
Stack trace: mutex_vector_enter <- usl_sync_check_sig <- usl_detachproc <-
wsdisplay_switch <- wskbd_translate <- ws

Don't call usl_sync_check_sig from an interrupt context. Call it only if waitok.
Stack trace: mutex_vector_enter <- usl_sync_check_sig <- usl_detachproc <-
wsdisplay_switch <- wskbd_translate <- wskbd_input <-
pckbd_input <- pckbcintr <- intr_biglock_wrapper <-
Xintr_ioapic_edge1
Reported by Anon Ymous

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Network protocol interrupts can now block on locks, so merge the globals
proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock).
Implications:

- Inspecting process state requires

Network protocol interrupts can now block on locks, so merge the globals
proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock).
Implications:

- Inspecting process state requires thread context, so signals can no longer
be sent from a hardware interrupt handler. Signal activity must be
deferred to a soft interrupt or kthread.

- As the proc state locking is simplified, it's now safe to take exit()
and wait() out from under kernel_lock.

- The system spends less time at IPL_SCHED, and there is less lock activity.

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restructure things a bit so that proclist_mutex is held between the
p_find() and the psignal() which is its purpose after all

Use aprint API for output and convert to device_t/softc separation.

Use callout_setfunc/callout_schedule instead of callout_reset.
Use mstohz for the calculations.

Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

Merge newlock2 to head.

Adapt to recent machdep scope changes.

Pointed out by Kouichirou Hiratsuka, thanks!

__unused removal on arguments; approved by core.

COMPAT_10 implies COMPAT_11, so there's no need to test both.
Also collapse two tightly-nested #ifs into one.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

Use kauth(9) instead of securelevel.

okay cube@

- Use the LWP cached credentials where sane.
- Minor cosmetic changes.

integrate kauth.

Don't use intarg uninitialized in wsdisplay_usl_ioctl2. Fixes CID 2507

merge ktrace-lwp.