Re: [PATCH v4] sched/core: Use zero length to reset cpumasks in sched_setaffinity()

[Waiman Long]

On 10/4/23 08:34, 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@xxxxxxxxxxxxx>
> 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.

I believe the macro just use sizeof(cpu_set_t) as the size of the 
bitmask. It is the same case as in CPU_ZERO().

Regards,
Longman