linux-kernel - Re: [RFC PATCH v1 00/57] Boot-time page size selection for arm64

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Message-ID: <aa9a7118-3067-448e-aa34-bbc148c921a2@arm.com>
Date: Thu, 17 Oct 2024 13:32:43 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Petr Tesarik <ptesarik@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Anshuman Khandual <anshuman.khandual@....com>,
 Ard Biesheuvel <ardb@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
 David Hildenbrand <david@...hat.com>, Greg Marsden
 <greg.marsden@...cle.com>, Ivan Ivanov <ivan.ivanov@...e.com>,
 Kalesh Singh <kaleshsingh@...gle.com>, Marc Zyngier <maz@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Matthias Brugger <mbrugger@...e.com>,
 Miroslav Benes <mbenes@...e.cz>, Will Deacon <will@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org
Subject: Re: [RFC PATCH v1 00/57] Boot-time page size selection for arm64

On 17/10/2024 13:27, Petr Tesarik wrote:
> On Mon, 14 Oct 2024 11:55:11 +0100
> Ryan Roberts <ryan.roberts@....com> wrote:
> 
>> [...]
>> The series is arranged as follows:
>>
>>   - patch 1:	   Add macros required for converting non-arch code to support
>>   		   boot-time page size selection
>>   - patches 2-36:  Remove PAGE_SIZE compile-time constant assumption from all
>>   		   non-arch code
> 
> I have just tried to recompile the openSUSE kernel with these patches
> applied, and I'm running into this:
> 
>   CC      arch/arm64/hyperv/hv_core.o
> In file included from ../arch/arm64/hyperv/hv_core.c:14:0:
> ../include/linux/hyperv.h:158:5: error: variably modified ‘reserved2’ at file scope
>   u8 reserved2[PAGE_SIZE - 68];
>      ^~~~~~~~~
> 
> It looks like one more place which needs a patch, right?

As mentioned in the cover letter, so far I've only converted enough to get the
defconfig *image* building (i.e. no modules). If you are compiling a different
config or compiling the modules for defconfig, you will likely run into these
types of issues.

That said, I do have some patches to fix Hyper-V, which Michael Kelley was kind
enough to send me.

I understand that Suse might be able to help with wider performance testing - if
that's the reason you are trying to compile, you could send me your config and
I'll start working on fixing up other drivers?

Thanks,
Ryan

> 
> Petr T