linux-kernel - Re: Regression - SATA disks behind USB ones on v4.8-rc1, breaking boot. [Re: Who reordered my disks (probably v4.8-rc1 problem)]

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Message-ID: <CAGnHSEnXo8VRm5Y6S6axpe-hG6an8ceujLajbZmxbGGDnCGh2w@mail.gmail.com>
Date:	Sun, 14 Aug 2016 18:17:39 +0800
From:	Tom Yan <tom.ty89@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	james harvey <jamespharvey20@...il.com>,
	regressions@...mhuis.info, hdegoede@...hat.com,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: Regression - SATA disks behind USB ones on v4.8-rc1, breaking
 boot. [Re: Who reordered my disks (probably v4.8-rc1 problem)]

On 14 August 2016 at 18:07, Tom Yan <tom.ty89@...il.com> wrote:
> On 14 August 2016 at 18:01, Pavel Machek <pavel@....cz> wrote:
>>
>> Since SATA support was merged, certainly since v2.4, and from way
>> before /dev/disk/by-id existed.
>
> I have no idea how "SATA before USB" had been done in the past (if it
> was ever a thing in the kernel), but that has not been the case since
> at least v3.0 AFAIR.
>
>>
>> People may not run udev, and you can't use /dev/disk/by-id on kernel
>> command line.
>>
>
> No, but you can always use root=PARTUUID=, that's built into the
> kernel. (root=UUID= requires udev or so though).

Silly me. root=UUID= has nothing to do with udev, but `blkid` in
util-linux. At least that's how it's done in Arch/mkinitcpio.