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

[Guenter Roeck]

On 5/3/22 00:17, Arnd Bergmann wrote:
> On Tue, May 3, 2022 at 4:55 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > On 5/2/22 14:03, Arnd Bergmann wrote:
> > > On Mon, May 2, 2022 at 10:35 PM Guenter Roeck <linux@xxxxxxxxxxxx> 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.

Maybe it is a bit less; I only compared the size of "Image". Either case,
it is enough to cause the problem. I am not sure if it is worth the time
trying to track this down further.

Guenter