[Bug 200802] MAXCPU bump to 256 breaks ABI for cpuset_getaffinity/setaffinity

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200802

--- Comment #8 from Dmitry Chagin <dchagin@FreeBSD.org> ---
(In reply to Ed Maste from comment #7)
yeah, and this:

commit 01f74ccd5a0d1a444703e931339709c7de5296b5
Author:     Dmitry Chagin <dchagin@FreeBSD.org>
AuthorDate: 2023-01-29 12:35:18 +0000
Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
CommitDate: 2023-01-29 12:35:18 +0000

    libthr: Fix pthread_attr_[g|s]etaffinity_np to match it's manual and the
kernel.

    Since f35093f8 semantics of a thread affinity functions is changed to be a
    compatible with Linux:

    In case of getaffinity(), the minimum cpuset_t size that the kernel permits
is
    the maximum CPU id, present in the system, / NBBY bytes, the maximum size
is not
    limited.
    In case of setaffinity(), the kernel does not limit the size of the
user-provided
    cpuset_t, internally using only the meaningful part of the set, where the
upper
    bound is the maximum CPU id, present in the system, no larger than the size
of
    the kernel cpuset_t.

    To match pthread_attr_[g|s]etaffinity_np checks of the user-provided
cpusets to
    the kernel behavior export the minimum cpuset_t size allowed by running
kernel
    via new sysctl kern.sched.cpusetsizemin and use it in checks.

    Reviewed by:
    Differential Revision:  https://reviews.freebsd.org/D38112
    MFC after:              1 week

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