linux-kernel - Re: [PATCH v2 00/48] ARM: PXA multiplatform support

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Date:   Tue, 3 May 2022 09:17:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Lubomir Rintel <lkundrak@...sk>,
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Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support

On Tue, May 3, 2022 at 4:55 AM Guenter Roeck <linux@...ck-us.net> wrote:
> On 5/2/22 14:03, Arnd Bergmann wrote:
> > On Mon, May 2, 2022 at 10:35 PM Guenter Roeck <linux@...ck-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