From: David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>
To: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: John Paul Adrian Glaubitz
<glaubitz-1Olz3AKvcsuAKZTfuerNgRvVK+yQ3ZXh@public.gmane.org>,
Devicetree Compiler
<devicetree-compiler-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Tom Rini <trini-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>
Subject: Re: Testsuite failures on sparc64 due to unaligned access since 1.5.0
Date: Wed, 16 Dec 2020 16:46:45 +1100 [thread overview]
Message-ID: <20201216054645.GB310465@yekko.fritz.box> (raw)
In-Reply-To: <CAL_Jsq+N69AdhS+fa5VR_Y86_Sq5_sSNiKc14fW6B1fHRbYBEg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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On Fri, Dec 11, 2020 at 08:03:42AM -0600, Rob Herring wrote:
> On Thu, Dec 10, 2020 at 7:09 PM David Gibson
> <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org> wrote:
> >
> > On Thu, Dec 10, 2020 at 10:04:47AM +0100, John Paul Adrian Glaubitz wrote:
> > > On 12/10/20 10:01 AM, John Paul Adrian Glaubitz wrote:
> > > > I have not done any bisecting yet, but this is most likely a result of someone casting
> > > > a pointer of type A into a pointer of type B which is normally not allowed but unfortunately
> > > > also not something that gcc complains about.
> > >
> > > Hmm, it seems someone fixed the issue on git master already:
> >
> > Right, alignment issues have been a perennial problem. We find some
> > platform that has alignment constraints that break, fix that, then
> > someone finds the alignment fixups cause horrible performance
> > problems, repeat ad nauseum.
> >
> > There's been another round of this pretty recently, which is probably
> > the cause of the fixup. I just hope the re-optimizations that Tom
> > Rini has in his pipeline don't break things again for you.
>
> I think the case here is dtc, not libfdt. My guess is something to do
> with marker handling writing out dts.
Ah, sorry, I wasn't paying sufficiently close attention.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2020-12-16 5:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 9:01 Testsuite failures on sparc64 due to unaligned access since 1.5.0 John Paul Adrian Glaubitz
[not found] ` <10d4dbcb-506c-df88-cd71-f3ad27254341-1Olz3AKvcsuAKZTfuerNgRvVK+yQ3ZXh@public.gmane.org>
2020-12-10 9:04 ` John Paul Adrian Glaubitz
[not found] ` <4e3cdb1c-87c4-810b-513d-eaae64456d36-1Olz3AKvcsuAKZTfuerNgRvVK+yQ3ZXh@public.gmane.org>
2020-12-11 1:07 ` David Gibson
[not found] ` <20201211010739.GB4874-l+x2Y8Cxqc4e6aEkudXLsA@public.gmane.org>
2020-12-11 14:03 ` Rob Herring
[not found] ` <CAL_Jsq+N69AdhS+fa5VR_Y86_Sq5_sSNiKc14fW6B1fHRbYBEg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-12-16 5:46 ` David Gibson [this message]
2020-12-11 14:14 ` John Paul Adrian Glaubitz
[not found] ` <3b237853-dd8c-99b7-e258-7c51e9970560-1Olz3AKvcsuAKZTfuerNgRvVK+yQ3ZXh@public.gmane.org>
2020-12-11 14:41 ` Tom Rini
2020-12-11 14:57 ` John Paul Adrian Glaubitz
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