On Sun, Oct 06, 2024 at 10:57:23AM +0200, Dag-Erling Smørgrav wrote: > Konstantin Belousov <kostik...@gmail.com> writes: > > We do not provide forward compatibility between kernel and userspace. > > User binaries must be newer than kernel. > > Uh, no. The opposite, in fact.
Right, it is opposite. It was a typo. Anyway, __FreeBSD_version is not about compatibility between specific snapshot of kernel and user sources. It de-facto provides two technical measures: 1. kernel refuses to load modules built against headers set with higher __FreeBSD_version than kernel 2. Some values of __FreeBSD_version are used by userspace to detect if specific change is present in kernel. See sys/param.h P_OSREL_ list.
