linux-kernel - Re: N900 v3.19-rc5 arm atags_to

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Date:	Mon, 2 Feb 2015 08:56:15 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Pavel Machek <pavel@....cz>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tony Lindgren <tony@...mide.com>,
	Pali Rohár <pali.rohar@...il.com>,
	linux-omap <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sebastian Reichel <sre@...nel.org>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Laura Abbott <lauraa@...eaurora.org>,
	Russell King <rmk@....linux.org.uk>
Subject: Re: N900 v3.19-rc5 arm atags_to_fdt.c is broken

On Mon, 2 Feb 2015, Pavel Machek wrote:

> On Tue 2015-01-27 10:16:24, Nicolas Pitre wrote:
> > On Tue, 27 Jan 2015, Pavel Machek wrote:
> > 
> > > 
> > > > > > I would say, problem is because omap3-n900 binary DT is too large
> > > > 
> > > > I agree.
> > > > 
> > > > > OK if that's the case, then your patch makes sense to me. It also
> > > > > seems we can have the temporary stack be larger than the initial
> > > > > stack just for atags_to_fdt.
> > > > 
> > > > The stack size isn't the issue, but rather its location.  We need to 
> > > > position it away from the DT data.  The DT size is known and we could 
> > > > use that, plus some room for the insertion of new data coming from the
> > > > ATAG conversion.
> > > > 
> > > > Something like the following would be a more robust solution:
> > > 
> > > Tested-by: Pavel Machek <pavel@....cz>
> > > 
> > > (Note, that in 3.19 dts for n900 got too big, so we are actually
> > > triggering old bugs. That means that this is a regression fix, and
> > > should go in ASAP).
> > 
> > It is queued here:
> > http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8294/1
> 
> Hmm, but it should be on kernel.org, not in private arm trees, as it
> fixes a regression. Russell, you are the ARM maintainer, can you push
> it to Linus?

The patch is included in RMK's "fixes" branch already, along with other 
fixes.  I suppose it'll make its way to Linus before v3.19 final.


Nicolas
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