linux-kernel - Re: [regression] Bug 217037 - cmb attributes missing from the nvme class under sysfs

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Date:   Thu, 16 Feb 2023 08:19:17 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, michallinuxstuff@...il.com
Subject: Re: [regression] Bug 217037 - cmb attributes missing from the nvme
 class under sysfs

On Thu, Feb 16, 2023 at 10:28:55AM +0100, Linux regression tracking (Thorsten Leemhuis) wrote:
> Hi, this is your Linux kernel regression tracker.
> 
> I noticed a regression report in bugzilla.kernel.org. As many (most?)
> kernel developer don't keep an eye on it, I decided to forward it by
> mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=217037 :
> 
> >  michallinuxstuff@...il.com 2023-02-14 14:16:26 UTC
> > 
> > For the CMB-capable nvme ctrls, kernel was exposing couple of related attributes under the sysfs. E.g.
> > 
> > 
> > # grep . /sys/class/nvme/nvme0/cmb*
> > /sys/class/nvme/nvme0/cmb:cmbloc : x00000062
> > /sys/class/nvme/nvme0/cmb:cmbsz  : x0008021d
> > /sys/class/nvme/nvme0/cmbloc:98
> > /sys/class/nvme/nvme0/cmbsz:524829

The breakage is that the attributes are decided before we've setup the cmb
regions. I'll send a fix shortly.