dtrace_sdt: Fix bug in builtin module reference counting.

Don't module_hold(NULL)! This mistake was introduced in my attempt
to get dtrace working for sdt probes defined in non-builtin modules
like

dtrace_sdt: Fix bug in builtin module reference counting.

Don't module_hold(NULL)! This mistake was introduced in my attempt
to get dtrace working for sdt probes defined in non-builtin modules
like zfs.

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bsd.kmodule.mk: Build modules with KDTRACE_HOOKS if MKDTRACE=yes.

dtrace_sdt: Register sdt providers and probes in loaded modules too.

driver(9): devsw_detach never fails. Make it return void.

Prune a whole lotta dead branches as a result of this. (Some logic
calling this is also wrong for other reasons; devsw_detach is final
--

driver(9): devsw_detach never fails. Make it return void.

Prune a whole lotta dead branches as a result of this. (Some logic
calling this is also wrong for other reasons; devsw_detach is final
-- you should never have any reason to decide to roll it back. To be
cleaned up in subsequent commits...)

XXX kernel ABI change to devsw_detach signature requires bump

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Reserve DTrace sdt and fdt major numbers

Register cmajor 252 for fbt and 253 for sdt.

Previously the major number was picked randomly and it causes conflicts
with preallocated values for different

Reserve DTrace sdt and fdt major numbers

Register cmajor 252 for fbt and 253 for sdt.

Previously the major number was picked randomly and it causes conflicts
with preallocated values for different devices.

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merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of im

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
- dtrace FBT probes can now be placed in kernel modules.
- ZFS now supports mmap().

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PR/51118: Jared McNeill: Fix build on FreeBSD by removing osnet assert.h
and sys/limits.h and use sys/syslimits.h directly.

Use C99 initializers for the cdevsw

No functional change intended or expected.

Make assertion of linker_file #ifdef __FreeBSD__. Fixes DIAGNOSTIC build.

SDT is not a disease. Use const consistently.

Merge conflicts

Adapt to NetBSD modules and link set access.
XXX: We don't have an event system so that we can issue callback that
will be run on construction or destruction to enable and disable probes
XXX: We

Adapt to NetBSD modules and link set access.
XXX: We don't have an event system so that we can issue callback that
will be run on construction or destruction to enable and disable probes
XXX: We don't have a way to use link_sets across modules properly.

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Add proc:::exit
XXX: I am going to kill that soon and make the providers register automagically
with linker sets. This can't scale.

Fix inconsistency between module and internal names of sdt and fbt

PR 49697
OK wiz@

Fix module unload of dtrace, sdt and fbt

- Don't unload when there are users of dtrace
- Forbid auto unloading (not supported for now)

PR 49695

Fix dtrace kernel module build.
Add nodiscard to cdevsw.
They are not fixed in fallocate/fdiscard changes.

Fix a local var name.

KNF.

make dtrace compile on amd64.

DTrace: add a dependency on the dtrace module.

DTrace: update sdt.c handlers to match latest OpenSolaris vendor import.

DTrace: Add an SDT (Statically Defined Tracing) provider framework, and
implement most of the proc provider. Adds proc:::create, exec,
exec_success, exec_faillure, signal_send, signal_discard, signa

DTrace: Add an SDT (Statically Defined Tracing) provider framework, and
implement most of the proc provider. Adds proc:::create, exec,
exec_success, exec_faillure, signal_send, signal_discard, signal_handle,
lwp_create, lwp_start, lwp_exit.

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Apply NetBSD changes to DTrace.

Ok with core@.

Add the FreeBSD 8-RC1 changes for DTrace.

Ok with core@.