linux-kernel - Re: [PATCH] ARM: add a private asm/unaligned.h

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Message-ID: <20171030165907.GB27404@n2100.armlinux.org.uk>
Date:   Mon, 30 Oct 2017 16:59:07 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Arnd Bergmann <arnd@...db.de>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Petr Cvek <petrcvekcz@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrea Adami <andrea.adami@...il.com>,
        Romain Izard <romain.izard.pro@...il.com>,
        Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: add a private asm/unaligned.h

On Mon, Oct 30, 2017 at 03:35:38PM +0000, Ard Biesheuvel wrote:
> Well, that is disappointing. This means the ASSERT() does not work
> reliably, and we're back to using a bunch of shell scripts to check
> whether _edata appears at the end of the image.

That didn't work too well here.  While it did correctly detect some
instances:

zImage size (8008200) disagrees with linked size (8008192)

it also misdetected others:

zImage size (13348808) disagrees with linked size (-928003328)

It seems to suggest that _magic_end - _magic_start = 0xc8afcb00.
zImage size is 0xcbafc8.  That points at the addresses output by
"nm" being dependent on the endian-ness of the image, which to
me seems utterly insane.

I wouldn't be surprised if that is toolchain version dependent
as well.

IMHO, our toolchain is a mess!

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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