linux-kernel - Re: linux 4.2-rc1 broken Nokia N900

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Message-ID: <20150714074532.GI17550@atomide.com>
Date:	Tue, 14 Jul 2015 00:45:33 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Michael Welling <mwelling@...e.org>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Nishanth Menon <nm@...com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: linux 4.2-rc1 broken Nokia N900

* Pali Rohár <pali.rohar@...il.com> [150714 00:16]:
> On Monday 13 July 2015 17:36:07 Michael Welling wrote:
> > On Tue, Jul 14, 2015 at 12:02:44AM +0200, Pali Rohár wrote:
> > > I think nothing special. I just call:
> > > 
> > > export ARCH=arm
> > > export CROSS_COMPILE=arm-linux-gnueabi-
> > > make rx51_defconfig
> > > rm -f arch/arm/boot/zImage
> > > make -j12 zImage modules omap3-n900.dtb CONFIG_DEBUG_SECTION_MISMATCH=y
> > > cat arch/arm/boot/zImage arch/arm/boot/dts/omap3-n900.dtb > arch/arm/boot/zImage.new
> > > mv arch/arm/boot/zImage.new arch/arm/boot/zImage
> > >
> > 
> > Where are you getting rx51_defconfig from?
> > 
> > This does not appear to be in the kernel source any longer.
> > 
> > Can you try the above with omap2plus_defconfig?
> >  
> 
> It is in my linux-n900 repository: https://github.com/pali/linux-n900
> Repository contains more n900 specific patches but SPI code is unpatched
> 
> https://github.com/pali/linux-n900/blob/HEAD/arch/arm/configs/rx51_defconfig
> 
> Later in week I can try to compile also with omap2plus_defconfig...
> But in my opinion kernel should not crash with different configuration.

After doing git bisect on it, looks like the breaking commit is
ddcad7e9068e ("spi: omap2-mcspi: Fix native cs with new set_cs").

That alone does not seem to revert, have not debugged further.

Regards,

Tony
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