linux-kernel - Re: [PATCH] block: partitions: efi: Always check for alternative GPT at end of drive

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Message-ID: <CAMHSBOW7MBtpVPZdt8yGggUhxk_ca3U+w9Wc-vg5fX7G-jB6mQ@mail.gmail.com>
Date:	Tue, 26 Apr 2016 14:51:01 -0700
From:	Gwendal Grignou <gwendal@...omium.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	"Elliott, Robert (Persistent Memory)" <elliott@....com>,
	Karel Zak <kzak@...hat.com>,
	Julius Werner <jwerner@...omium.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	Gwendal Grignou <gwendal@...omium.org>,
	Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH] block: partitions: efi: Always check for alternative GPT
 at end of drive

On Tue, Apr 26, 2016 at 2:15 PM, Davidlohr Bueso <dave@...olabs.net> wrote:
> On Tue, 26 Apr 2016, Elliott, Robert (Persistent Memory) wrote:
>

>
> I have nothing against the agpt, just pass a boot param and voila,
> you can use it. This is not some sort of recent regression we are
> talking about here. How is this such a burden all of a sudden?
Julius and I were looking at the code when we spotted the issue.

As Julius said, "just pass a boot param", is not easy on certain
machines, like phone. It is not user friendly either.
The system won't boot at all, a typical user will have to do a full
reinstall to fix the error.

Running with forced_gpt always on is not a solution either, because SD
card formatted with a plain MBR over an older image with a GPT won't
be mounted properly: that newer MBR will be ignored.

Gwendal.
>
> Thanks,
> Davidlohr