Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model

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To: Ingo Molnar <mingo@xxxxxxxxxx>
Subject: Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Fri, 16 May 2025 08:46:07 -0700
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Kieran Bingham <kbingham@xxxxxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, Sandipan Das <sandipan.das@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <aCdbOeK3EkVUTGD2@gmail.com>
References: <20250516123306.3812286-1-kirill.shutemov@linux.intel.com> <20250516123306.3812286-3-kirill.shutemov@linux.intel.com> <30570ca0-8da4-4ebc-84d6-0a4badfb7154@intel.com> <rqkfqkkli57fbd5zkj3bwko44kmqqwnfdm766snm26y2so52ss@6it24qxv356q> <aCdGzpXSVx15gz90@gmail.com> <a0ca765c-a506-4c1f-a38c-24a8074988df@intel.com> <aCdbOeK3EkVUTGD2@gmail.com>
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On 5/16/25 08:35, Ingo Molnar wrote:
>   .config.opensuse.default:    CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>   .config.ubuntu.localinstall: CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>   .config.fedora.generic:      CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>   .config.rhel.generic:        CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y

That reminds me...

Does everybody keep their own local copies of these configs in their
environment? I do, and I refresh them periodically from the distros. I
assume everybody else is doing something similar.

Is there a better way?

Follow-Ups:
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: H. Peter Anvin

References:
- [PATCHv3 0/4] x86: Make 5-level paging support unconditional for x86-64
  - From: Kirill A. Shutemov
- [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Kirill A. Shutemov
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Dave Hansen
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Kirill A. Shutemov
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Ingo Molnar
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Dave Hansen
- Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model
  - From: Ingo Molnar

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