Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__

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To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 2 Jun 2023 21:10:14 +0200
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Boqun Feng <boqun.feng@xxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, dennis@xxxxxxxxxx, Tejun Heo <tj@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, gor@xxxxxxxxxxxxx, Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, borntraeger@xxxxxxxxxxxxx, Sven Schnelle <svens@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Joerg Roedel <joro@xxxxxxxxxx>, suravee.suthikulpanit@xxxxxxx, Robin Murphy <robin.murphy@xxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxx, Linux-Arch <linux-arch@xxxxxxxxxxxxxxx>, linux-crypto@xxxxxxxxxxxxxxx, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, "James E . J . Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, John David Anglin <dave.anglin@xxxxxxxx>, Sam James <sam@xxxxxxxxxx>
In-reply-to: <E333E35E-5F9C-441C-B75A-082F19D37978@zytor.com>
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On Fri, Jun 02, 2023 at 10:00:17AM -0700, H. Peter Anvin wrote:

> Dumb question: is this only about the cpp macro or is it about __int128 existing at all?

It's mostly about __int128 being there, __SIZEOF_INT128__ is just the
way we go about detecting if it's there or not.

Follow-Ups:
- Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: H. Peter Anvin

References:
- [PATCH 00/12] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double()
  - From: Peter Zijlstra
- [PATCH 07/12] percpu: #ifndef __SIZEOF_INT128__
  - From: Peter Zijlstra
- Re: [PATCH 07/12] percpu: #ifndef __SIZEOF_INT128__
  - From: Arnd Bergmann
- [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: Peter Zijlstra
- Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: Helge Deller
- Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: Linus Torvalds
- Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: Peter Zijlstra
- Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
  - From: H. Peter Anvin

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