linux-kernel - Re: [REGRESSION] bfq probe failed on 4.19-rc3

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Date:   Tue, 11 Sep 2018 18:11:43 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Paolo Valente <paolo.valente@...aro.org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] bfq probe failed on 4.19-rc3

On Tue, 11 Sep 2018 18:09:44 +0200,
Jens Axboe wrote:
> 
> On 9/11/18 10:03 AM, Takashi Iwai wrote:
> > Hi,
> > 
> > I noticed that bfq doesn't appear in the I/O scheduler list on
> > 4.19-rc3.  It seems that blkcg_policy_register() at the beginning of
> > bfq_init() returns -ENOSPC, hence the probe aborts silently.
> > 
> > Is this already addressed?
> 
> Haven't heard about this one before. What kernel did you last use that
> worked?

IIRC, 4.18 worked fine.  Let me see whether I have a backup...


Takashi