Protect kernel hooks exechook, exithook and forkhook with rwlock.
Lock as writer on establish/disestablish and as reader on list traverse.

For exechook ride "exec_lock" as it is already take as read

Protect kernel hooks exechook, exithook and forkhook with rwlock.
Lock as writer on establish/disestablish and as reader on list traverse.

For exechook ride "exec_lock" as it is already take as reader when
traversing the list. Add local locks for exithook and forkhook.

Move exec_init before signal_init as signal_init calls exechook_establish()
that needs "exec_lock".

PR kern/39913 "exec, fork, exit hooks need locking"

show more ...

kern/kern_hook.c: Get exec_lock from sys/exec.h.

fix various typos in comments, documentation and messages.

Only one space after comma

Some platforms need sys/cpu.h for curlwp so #include it

KNF

Introduce a generic linear hook list

Add and use __FPTRCAST, requested by uwe@

Add void * function pointer casts. There are different ways to "fix" those
warnings:
1. this one: add a void * cast (which I think is the least intrusive)
2. add pragmas to elide the warning

Add void * function pointer casts. There are different ways to "fix" those
warnings:
1. this one: add a void * cast (which I think is the least intrusive)
2. add pragmas to elide the warning
3. add intermediate inline conversion functions
4. change the called function prototypes, adding unused arguments and
converting some of the pointer arguments to void *.
5. make the functions varyadic (which defeats the purpose of checking)
6. pass command line flags to elide the warning
I did try 3 and 4 and I was not pleased with the result (sys_ptrace_common.c)
(3) added too much code and defines, and (4) made the regular use clumsy.

show more ...

convert vmem, signals, powerhooks from CIRCLEQ -> TAILQ.

split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

Add critpoll (critical polling) hooks. These are keep things like watchdogs
from firing when the system is doing stuff like waiting at a ddb prompt or
the kernel is doing a lot of printing.

This is using device_t, so it needs to include <sys/device.h>.

Pass root device as a parameter to domountroothook().

Place *hook implementations in kern_hook.c instead of them floating
around in the kern_subr.c gruel. Arrrrr.