vm: Change 'kernel_map' global to type of 'struct vm_map *'

Change the global variable 'kernel_map' from type 'struct vm_map' to a
pointer to this struct. This simplify the code a bit since all
inv

vm: Change 'kernel_map' global to type of 'struct vm_map *'

Change the global variable 'kernel_map' from type 'struct vm_map' to a
pointer to this struct. This simplify the code a bit since all
invocations take its address. This change also aligns with NetBSD's
'kernal_map' that it's also a pointer, which also helps the porting of
NVMM.

No functional changes.

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kernel - Add PROC_PDEATHSIG_CTL and PROC_PDEATHSIG_STATUS

* Add PROC_PDEATHSIG_CTL and PROC_PDEATHSIG_STATUS to procctl(2).

This follows the linux and freebsd semantics, however it should be note

kernel - Add PROC_PDEATHSIG_CTL and PROC_PDEATHSIG_STATUS

* Add PROC_PDEATHSIG_CTL and PROC_PDEATHSIG_STATUS to procctl(2).

This follows the linux and freebsd semantics, however it should be noted
that since the child of a fork() clears the setting, these semantics have
a fork/exit race between an exiting parent and a child which has not
yet setup its death wish.

* Also fix a number of signal ranging checks.

Requested-by: zrj

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