Re: [PATCH] percpu-refcount: relax limit on percpu_ref_reinit()

Tejun Heo
2018-09-11T18:43:31Z

Hello,

On Tue, Sep 11, 2018 at 12:40:36PM +0800, jianchao.wang wrote:
> (long)(sum (every cpu's refcounter)) + atomic refcounter
>
> and when switch to atomic mode, there could be value left in atomic refcounter.
> then the unsigned long percpu refcounter cound be decreased from 0.

It can always do that. Imagine a task getting a ref on one cpu,
migrating and putting it on another. The only thing which matters is
that the sum of everything adds upto what it should be.

Thanks.

--
tejun