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

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Message-ID: <20200102183938.4kazwvk3ecgfwvy7@ucw.cz>
Date:   Thu, 2 Jan 2020 19:39:38 +0100
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Arnd Bergmann <arnd@...db.de>, 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

Hi!

> * 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.

Aha, thanks for a hint!

Yes, due to the kexec setup, I was using old dtb (5.3-rc?) with new
kernel...

Let me try with matching kernel+dtb combination.

Best regards,
								Pavel