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    SubjectRe: [PATCH v4] sched/core: Use zero length to reset cpumasks in sched_setaffinity()
    On Wed, Oct 04, 2023 at 02:34:15PM +0200, Florian Weimer wrote:
    > * Peter Zijlstra:
    >
    > > Subject: sched: Add CPU_FILL()
    > >
    > > Add the CPU_FILL() macros to easily create an all-set cpumask.
    > >
    > > FreeBSD also provides this macro with this semantic.
    > >
    > > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    >
    > My main concer is that obtaining the size of the mask, or at least an
    > approximiation is not exactly easy. If there's an expectation that
    > applications reset the mask more often than they do today (I don't have
    > the full context here), then we'd some decent interface to get the
    > approriate size.

    Isn't sysconf(_SC_NPROCESSORS_CONF) the right number ?

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