Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (M of N)

[kaktus]

Summary

r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes.
This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags.

You’re asked for a review based on src/MAINTAINERS entry.

[erj]

Is there a reason that these syctls would need "CTLFLAG_NEEDSGIANT", or does this patch default to that flag because it's a safe default if the contents of the sysctl are unknown? I'm aware of the previous review that added these flags, but I didn't get to look at it too closely.

[kaktus]

That is exactly the reason: sysctl's that weren't before marked as MPSAFE are marked as NEEDGIANT, but if you're happy with current locking (or lack of it if unneeded) I can mark them as MPSAFE.

[kaktus]

Committed as rS358286.