kern/57709: uvm_grow cannot be dtraced with fbt

[campbell+netbsd%mumble.net@localhost]

>Number:         57709
>Category:       kern
>Synopsis:       uvm_grow cannot be dtraced with fbt
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 19 22:10:00 +0000 2023
>Originator:     Taylor R Campbell
>Release:        current
>Organization:
The NetBSD Stackgrowdation
>Environment:
>Description:
The function uvm_grow does not appear with fbt probes, entry or return, so it can't be dtraced as such.

Perhaps whatever problem is affecting uvm_grow might also affect other symbols in the kernel too.
>How-To-Repeat:
# dtrace -n 'fbt::uvm_grow:entry { @[stack()] = count() }'
dtrace: invalid probe specifier fbt::uvm_grow:entry { @[stack()] = count() }: probe description fbt::uvm_grow:entry does not match any probes
# dtrace -l -P fbt | grep uvm_grow
# 

>Fix:
Yes, please!