Re: N900 v3.19-rc5 arm atags_to_fdt.c is broken

From: Tony Lindgren <tony@atomide.com>
To: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: "Pavel Machek" <pavel@ucw.cz>,
	"Pali Rohár" <pali.rohar@gmail.com>,
	linux-omap <linux-omap@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Aaro Koskinen" <aaro.koskinen@iki.fi>,
	"Sebastian Reichel" <sre@kernel.org>,
	"Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>,
	"Russell King" <linux@arm.linux.org.uk>,
	linux-arm-kernel@lists.infradead.org,
	"Laura Abbott" <lauraa@codeaurora.org>
Subject: Re: N900 v3.19-rc5 arm atags_to_fdt.c is broken
Date: Tue, 27 Jan 2015 07:26:53 -0800	[thread overview]
Message-ID: <20150127152653.GI28663@atomide.com> (raw)
In-Reply-To: <alpine.LFD.2.11.1501271014160.1322@knanqh.ubzr>

* Nicolas Pitre <nicolas.pitre@linaro.org> [150127 07:19]:
> 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@ucw.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

Thanks for fixing that one!

Regards,

Tony