linux-kernel - Re: [PATCH v2 1/4] null_blk: do not fail the module load with zero devices

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Message-ID: <BYAPR04MB57494AD6FADC0654403613CE86B30@BYAPR04MB5749.namprd04.prod.outlook.com>
Date:   Fri, 13 Sep 2019 22:37:23 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Bart Van Assche <bvanassche@....org>,
        André Almeida <andrealmeid@...labora.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "corbet@....net" <corbet@....net>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "kernel@...labora.com" <kernel@...labora.com>,
        "krisman@...labora.com" <krisman@...labora.com>
Subject: Re: [PATCH v2 1/4] null_blk: do not fail the module load with zero
 devices

On 09/13/2019 03:18 PM, Bart Van Assche wrote:
> I just noticed that this patch is necessary to unbreak blktests. The srp
> tests fail as follows with Jens' for-next branch:
>
> modprobe: ERROR: could not insert 'null_blk': Invalid argument
>
> I think that error is triggered by the following statement in
> common/multipath-over-rdma:
>
>       modprobe null_blk nr_devices=0 || return $?
>
> Bart.
>

Not only that I'm sure my membacked null_blk testcases will also start
failing without this patch, which I've not posted on mailing list yet.