Change Details

The FreeBSD linux/compiler.h in OpenZFS was copied from a very old version of FreeBSD's linuxkpi's linux/compiler.h. This worked well enough until we started needing to tweak FreeBSD's linuxkpi version and also OpenZFS's. To ensure more compatibility, move to using FreeBSD's linuxkpi compiler.h always, and augmenting it with just a few things that OpenZFS needs. Move from using #ifdef guards to #pragma once because FreeBSD 12's linuxkpi compiler.h uses the same #defines (newer versions a different macro). Also, conditionally provide the *_ONCE macros since both FreeBSD 12 and 13 don't consistently define them. Remove extra copies of macros that are defined here. Sponsored-by: Netflix

The FreeBSD linux/compiler.h in OpenZFS was copied from a very old version of FreeBSD's linuxkpi's linux/compiler.h. There's no need for this duplication. Use FreeBSD's linuxkpi version instead, and provide zfs_fallthrough to augment it (it's all that's needed). Use #pragma once to avoid naming issues for guard variables. Since this is a complete rewrite, use my copyright here (the original code in FreeBSD still credits everybody). Remove extra copies of macros that were defined elsewhere, but are now properly defined in LinuxKPI so are redundant.

The FreeBSD linux/compiler.h in OpenZFS was copied from a very old version of FreeBSD's linuxkpi's linux/compiler.h. This worked wellThere's no need for enough until we started needing to tweakthis duplication. Use FreeBSD's linuxkpi version andn instead, and provide also OpenZFS's. To ensure more compatibility,zfs_fallthrough to augment it (it's all that's needed). move to using FreeBSD'sUse #pragma once linuxkpi compiler.h always,to avoid naming issues for guard variables. and augmenting it with just a few thingsSince this is a complete that OpenZFS needs.rewrite, Move from using #ifdef guards to #pragma onceuse my copyright here (the original code in FreeBSD still because FreeBSD 12's linuxkpi compiler.h usecredits everybody). Remove extra copies of macros the same #at were defines (newerd elsewhere, but are now versions a different macro). Also, conditionally provide the *_ONCEproperly defined in LinuxKPI so are redundant. macros since both FreeBSD 12 and 13 don't consistently define them. Remove extra copies of macros that are defined here. Sponsored-by: Netflix