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Message-ID: <ZK12QT9C7avQOjxU@kbusch-mbp.dhcp.thefacebook.com>
Date:   Tue, 11 Jul 2023 09:33:21 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Pankaj Raghav <p.raghav@...sung.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Jens Axboe <axboe@...nel.dk>, Sagi Grimberg <sagi@...mberg.me>,
        "Clemens S." <cspringsguth@...il.com>,
        Martin Belanger <martin.belanger@...l.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        John Meneghini <jmeneghi@...hat.com>,
        Hannes Reinecke <hare@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux NVMe <linux-nvme@...ts.infradead.org>,
        Kanchan Joshi <joshi.k@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        박진환 <jh.i.park@...sung.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Fwd: Need NVME QUIRK BOGUS for SAMSUNG MZ1WV480HCGL-000MV
 (Samsung SM-953 Datacenter SSD)

On Tue, Jul 11, 2023 at 02:06:09PM +0200, Christoph Hellwig wrote:
> On Tue, Jul 11, 2023 at 11:39:11AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> > Well, that "They keep pumping out more and more devices with the same
> > breakage" and the "new device" comment from Pankaj below bear the
> > question: should we stop trying to play "whack a mole" with all those
> > quirk entries and handle devices with duplicate ids just like Windows does?
> 
> As far as I can tell Windows completely ignores the IDs.  Which, looking
> back, I'd love to be able to do as well, but they are already used
> by udev for the /dev/disk/by-id/ links.   Those are usually not used
> on desktop systems, as they use the file system labels and UUIDs, but
> that doesn't work for non-file system uses.

It's also an inescapable requirement for supporting multipath, and a
number of the devices being quirked bizarrely also report CMIC/NMIC
capabilities.

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