linux-kernel - Re: v5.9-rc1 commit reliably breaks pci nvme detection

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Date:   Thu, 20 Aug 2020 19:07:29 +0200
From:   "Ahmed S. Darwish" <a.darwish@...utronix.de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: v5.9-rc1 commit reliably breaks pci nvme detection

On Thu, Aug 20, 2020 at 09:35:38AM -0600, Jens Axboe wrote:
> On 8/17/20 9:58 AM, Jens Axboe wrote:
> > On 8/17/20 8:56 AM, Keith Busch wrote:
> >> On Mon, Aug 17, 2020 at 03:50:11PM +0200, Ahmed S. Darwish wrote:
> >>> Hello,
> >>>
> >>> Below v5.9-rc1 commit reliably breaks my boot on a Thinkpad e480
> >>> laptop. PCI nvme detection fails, and the kernel becomes not able
> >>> anymore to find the rootfs / parse "root=".
> >>>
> >>> Bisecting v5.8=>v5.9-rc1 blames that commit. Reverting it *reliably*
> >>> fixes the problem and makes me able to boot v5.9-rc1.
> >>
> >> The fix is staged in the nvme tree here:
> >>
> >>   http://git.infradead.org/nvme.git/commit/286155561ecd13b6c85a78eaf2880d3baea03b9e
> >
> > That would have been nice to have in -rc1...
>
> And now we're getting very close to shipping items for -rc2, and it's still
> not in. Can we please get the nvme pull request out for -rc2?
>

I keep wondering that myself. Completely breaking the boot like this is
really not nice -- and for x86-64 laptops no less :-(

The fix is really small and isolated. "Urgent pull requests", containing
only a fix or two, were created *exactly* for this reson...

Thanks,

--
Ahmed S. Darwish
Linutronix GmbH