imx6 wand board lockdep warnings on boot

imx6 wand board lockdep warnings on boot

[Kevin Hilman]

For awhile now, the wand boards have had some noisy lockdep warnings
during boot, but I'm not sure if anyone is looking into them.  I see
it on the wand-solo and wand-quad, but not the dual.  Full boot logs
for all three are attached from v3.13.

Kevin
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imx6 wand board lockdep warnings on boot

[Olof Johansson]

On Wed, Jan 29, 2014 at 1:52 PM, Kevin Hilman <khilman@linaro.org> wrote:
> For awhile now, the wand boards have had some noisy lockdep warnings
> during boot, but I'm not sure if anyone is looking into them.  I see
> it on the wand-solo and wand-quad, but not the dual.  Full boot logs
> for all three are attached from v3.13.

Yeah, this one is known -- Russell has mentioned it in the past too.

This reminds me, I've been meaning to turn on lockdep on all defconfig
builds so that we get coverage on more platforms, but I haven't done
it yet.


-Olof

imx6 wand board lockdep warnings on boot

[Russell King - ARM Linux]

On Wed, Jan 29, 2014 at 01:58:51PM -0800, Olof Johansson wrote:
> On Wed, Jan 29, 2014 at 1:52 PM, Kevin Hilman <khilman@linaro.org> wrote:
> > For awhile now, the wand boards have had some noisy lockdep warnings
> > during boot, but I'm not sure if anyone is looking into them.  I see
> > it on the wand-solo and wand-quad, but not the dual.  Full boot logs
> > for all three are attached from v3.13.
> 
> Yeah, this one is known -- Russell has mentioned it in the past too.
> 
> This reminds me, I've been meaning to turn on lockdep on all defconfig
> builds so that we get coverage on more platforms, but I haven't done
> it yet.

It's really worth considering that - as well as building the defconfigs -
that the defconfigs are built with the kernel debugging options forced on
so that things like locking problems are found.  Obviously, debug info is
one option you wouldn't want to turn on, because for a build+boot test
system, it just makes the objects unnecessarily larger and wastes disk
space (unless of course you intend to use the debug info.)

I've just modified all my oldconfig builds to have many of the debug
stuff enabled.

-- 
FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
Estimate before purchase was "up to 13.2Mbit".

imx6 wand board lockdep warnings on boot

[Fabio Estevam]

On Wed, Jan 29, 2014 at 7:52 PM, Kevin Hilman <khilman@linaro.org> wrote:
> For awhile now, the wand boards have had some noisy lockdep warnings
> during boot, but I'm not sure if anyone is looking into them.  I see
> it on the wand-solo and wand-quad, but not the dual.  Full boot logs
> for all three are attached from v3.13.

This has been fixed by this commit:

commit a974862faee199cba3ff36b5a148df5fd34bd1e7
Author: Dong Aisheng <b29396@freescale.com>
Date:   Thu Dec 26 15:23:53 2013 +0800

    mmc: sdhci-esdhc-imx: fix access hardirq-unsafe lock in atomic context

,which is in Linus' tree now.

It is also marked as 3.13 stable.

Regards,

Fabio Estevam