Rather than keeping a separate mutex, condvar, and pserialize for each
module hook, we can share a common set of synchronization structures.
This cuts the amount of cacheline_aligned data for these s

Rather than keeping a separate mutex, condvar, and pserialize for each
module hook, we can share a common set of synchronization structures.
This cuts the amount of cacheline_aligned data for these structures by
50%.

Note that we still have a per-hook localcount, since we need to count
individual references.

As discussed with riastradh@

Welcome to 9.99.22 !

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Actually return the updated pointer-to-mbuf-pointer to the caller
rather than discarding-after-assignment. Introduced from the
[pgoyette-compat] branch work.

Welcome to 9.99.14 !!! (Module hook ro

Actually return the updated pointer-to-mbuf-pointer to the caller
rather than discarding-after-assignment. Introduced from the
[pgoyette-compat] branch work.

Welcome to 9.99.14 !!! (Module hook routine prototype changed.)

Found by the lgtm bot, reported via private Email from maxv@

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Clean up this mess and simplify, so that all the socket options get
handled correctly whether or not the compat_50 module is loaded.

Split the COMPAT_50 socket-timeout stuff out of kern/uipc_socket.c
and into its own source file, which is now included in the compat_50
module.

(Not sure how this got missed during the original [pgo

Split the COMPAT_50 socket-timeout stuff out of kern/uipc_socket.c
and into its own source file, which is now included in the compat_50
module.

(Not sure how this got missed during the original [pgoyette-compat] work)

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