Re: lib/58729: container_of is not documented or available in userland

["Taylor R Campbell via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR lib/58729; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost, netbsd-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: lib/58729: container_of is not documented or available in userland
Date: Tue, 8 Oct 2024 14:28:33 +0000

 Small complication: container_of is defined in libkern.h and uses
 offsetof which, for the kernel, is also defined in libkern.h.
 
 So just moving container_of to another header file would create a
 circular dependency (libkern.h uses sys/container_of.h for
 container_of, and is used by sys/container_of.h for offsetof).
 
 To avoid that, we could:
 
 (a) split offsetof into another header file (maybe we should add
     sys/stddef.h), or
 
 (b) update all container_of users in kernel to use sys/container_of.h
     explicitly so libkern.h doesn't have to expose container_of
     itself.