| Flags |
- RD, Can read the value
- WR, Can write the value
- RW, RD and WR
- ANYBODY, All users can set this var
- TUN, Default value is loaded from getenv()
- RDTUN, RD and TUN
- RWTUN, RW and TUN
- NOFETCH, Don't fetch tunable from getenv()
- NEEDGIANT, Requires Giant lock
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