# Re: \[PATCH v3\] loop: reduce the loop\_ctl\_mutex scope

- From: Tetsuo Handa \<penguin-kernel@i-love.sakura.ne.jp\>
- Date: 2021-09-01 05:47:55 
- List: linux-block
- Page: https://ratatoskr.run/linux-block/2021/09/6405148
- Thread: https://ratatoskr.run/linux-block/2021/08/6405025/t.md

```text
On 2021/09/01 14:36, Christoph Hellwig wrote:
> On Mon, Aug 30, 2021 at 09:13:50AM +0200, Christoph Hellwig wrote:
>> Hi Tetsuo,
>>
>> this generally looks fine to me.  The only issue is that I remember is
>> that cmpxchg did historically not work on bool on all architectures.
>> I'm not sure if this has been fixed since.
> 
> Looks like that still is an issue based on the buildbot reports on
> linux-kernel.  I'd suggest to resend with idr_visible as an int.
> 

I sent "[PATCH v3] loop: reduce the loop_ctl_mutex scope" as not using cmpxchg().
The buildbot is reporting errors on the v2 patch.
```