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

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Date:   Thu, 20 Aug 2020 11:10:58 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     "Ahmed S. Darwish" <a.darwish@...utronix.de>
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 8/20/20 11:07 AM, Ahmed S. Darwish wrote:
> 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 :-(

To be fair, I've only heard this one complaint about it, so hopefully it's
not too widespread. I'm on an x86-64 laptop myself with nvme, and it works
just fine :-)

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

Totally agree on that, it should have gone in for -rc1. This will be going
upstream tomorrow, so the end is near...

-- 
Jens Axboe