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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Tue, 3 May 2022 09:17:20 +0200
Message-ID: <CAK8P3a39oiWyDwp=BHuCsBVwfzyZ802-NwL9G9r-t6X8KSr6nA@mail.gmail.com>
Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Daniel Mack <daniel@zonque.org>,
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On Tue, May 3, 2022 at 4:55 AM Guenter Roeck <linux@roeck-us.net> wrote:
> On 5/2/22 14:03, Arnd Bergmann wrote:
> > On Mon, May 2, 2022 at 10:35 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >> On 5/2/22 12:21, Arnd Bergmann wrote:
>
> qemu puts initrd in the middle of available memory. With the image size
> being ~1MB larger than with v5.18-rc, this is too much, and the kernel
> overwrites part of initrd. This causes it to be corrupted.
>
> It looks like that would have happened eventually, your patch series just
> made it happen now. The kernel is just getting too large to run on such small
> systems. I worked around the problem in my version of qemu by loading initrd
> at the end of the (small) RAM. With that, I no longer see the boot failure.

Ok, thanks for confirming. If it's just the image size that changed,
then I think
we can live with it. Having the kernel image grow by 1MB seems excessive
though, I'd like to understand better where that increase comes from.

Starting out from pxa_defconfig, I see a 40KB increase from the final patch
that moves to multiplatform support, which I think is fine.

If you have a z2 specific config, that would probably not enable CONFIG_OF,
which is always turned on for multiplatform, but again that only adds around
250KB in my builds (using gcc-11). This is more than I'd like it to be, but
still much less than 1MB.

        Arnd