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

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Message-ID: <20241206085026.32c89a03@mordecai.tesarici.cz>
Date: Fri, 6 Dec 2024 08:50:26 +0100
From: Petr Tesarik <ptesarik@...e.com>
To: Michael Kelley <mhklinux@...look.com>
Cc: Ryan Roberts <ryan.roberts@....com>, 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-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC PATCH v1 00/57] Boot-time page size selection for arm64

On Thu, 5 Dec 2024 18:52:35 +0000
Michael Kelley <mhklinux@...look.com> wrote:

> From: Petr Tesarik <ptesarik@...e.com> Sent: Thursday, December 5, 2024 9:20 AM
> > 
> > Hi Ryan,
> > 
> > On Thu, 17 Oct 2024 13:32:43 +0100
> > Ryan Roberts <ryan.roberts@....com> 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.
> > >
> > > 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?  
> > 
> > This project was de-prioritised for some time, but I have just returned
> > to it, and one of our test systems uses a Mellanox 5 NIC, which did not build.
> > 
> > If you still have time to work on your patch series, please, can you
> > look into enabling MLX5_CORE_EN?
> > 
> > Oh, and have you rebased the series to 6.12 yet?
> >   
> 
> FWIW, here's what I hacked together to compile and run the mlx5 driver in
> a Hyper-V VM.  This was against a 6.11 kernel code base.

Wow! Thank you, Michael. I'll give it a try.

Petr T