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

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Message-ID: <d4eb4752-d8c0-715a-1d69-829f39c88d2e@roeck-us.net>
Date:   Tue, 3 May 2022 07:04:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     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>,
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Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support

On 5/3/22 00:17, Arnd Bergmann wrote:
> 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.
> 

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