[Bug 270283] would like an even safer LIST_FOREACH_SAFE()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270283

Konstantin Belousov <kib@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib@FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
In such situation, where you have a possibility of uncontrolled removal of the
list elements, usual approach is to put a marker element on the list. The
marker should be not subject for removal by any regular operations.

See e.g. MNT_VNODE_FOREACH* and vm_pageout.c (search for marker).

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