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

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Message-ID: <fed3b427-a600-4ce5-afef-4ccbfff64931@oracle.com>
Date: Wed, 23 Oct 2024 17:00:45 -0400
From: Thomas Tai <thomas.tai@...cle.com>
To: Ryan Roberts <ryan.roberts@....com>, 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 10/17/2024 8:32 AM, Ryan Roberts wrote:
> 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.

It would be nice if you could provide the defconfig you are using; I also ran
into build issues when using the arch/arm64/configs/defconfig.
  
Thank you,
Thomas

>
> 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
>