linux-kernel - Re: Droid 4 regression in 5.5-rc1, armsoc-soc tree

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Message-ID: <20200102171140.GB16702@atomide.com>
Date:   Thu, 2 Jan 2020 09:11:40 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Pavel Machek <pavel@....cz>, Olof Johansson <olof@...om.net>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>, nekit1000@...il.com,
        Marcel Partap <mpartap@....net>, merlijn@...zup.org,
        martin_rysavy@...trum.cz
Subject: Re: Droid 4 regression in 5.5-rc1, armsoc-soc tree

* Arnd Bergmann <arnd@...db.de> [200102 14:48]:
> On Thu, Jan 2, 2020 at 3:06 PM Pavel Machek <pavel@....cz> wrote:
> 
> > # good: [ab818f0999dc73af3f966194d087e9f6650f939f] Merge tag
> > # 'omap-for-v5.5/maintainers-signed' of
> > # git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into
> > # arm/soc
> > git bisect good ab818f0999dc73af3f966194d087e9f6650f939f
> > # first bad commit: [38206c24ab09b4f4c2a57de5c1af0bb2e69cf5b6] Merge tag
> > # 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
> >
> > ...and am not sure how to interpret the result, or what to do next :(.
> 
> This means that either the bisection is unreliable (it might be 100%
> reproducible or you mixed up good/bad once), or that the arm-soc
> branch was indeed good by itself but had a conflict with some other
> change that torvalds merged earlier.
> 
> I would suggest to go back to the list I had extracted in my previous
> email and revert all the commits that I identify there, on top of
> linux-5.5-rc4. If some commit is not easily reverted, skip that one
> at first.
> 
> Ideally this gets you a working kernel based on -rc4, and then
> you can bisect that to find which revert fixed it.

Also please check your dtb is up to date. We still have a lot of
stuff missing from the device tree meaning an old dtb will likely
be incomplete for many devices.

Regards,

Tony