From: David Laight <david.laight.linux@gmail.com>
To: "Arnd Bergmann" <arnd@arndb.de>
Cc: "Arnd Bergmann" <arnd@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Richard Weinberger" <richard@nod.at>,
"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
"Johannes Berg" <johannes@sipsolutions.net>,
"Thomas Gleixner" <tglx@kernel.org>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Will Deacon" <will@kernel.org>, "Boqun Feng" <boqun@kernel.org>,
"Gary Guo" <gary@garyguo.net>,
"Yury Norov" <yury.norov@gmail.com>,
"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Alexander Usyskin" <alexander.usyskin@intel.com>,
"Anthony L Nguyen" <anthony.l.nguyen@intel.com>,
"Przemek Kitszel" <przemyslaw.kitszel@intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
linux-um@lists.infradead.org
Subject: Re: [PATCH 8/8] x86: simplify 32-bit instruction set selection
Date: Sat, 23 May 2026 11:02:16 +0100 [thread overview]
Message-ID: <20260523110216.2724bf6b@pumpkin> (raw)
In-Reply-To: <9789e44c-cad6-4fb9-b684-ed132347a92d@app.fastmail.com>
On Sat, 23 May 2026 10:51:41 +0200
"Arnd Bergmann" <arnd@arndb.de> wrote:
> On Fri, May 22, 2026, at 23:33, David Laight wrote:
...
> > But neither is really anything like even Sandy bridge.
>
> Sandy Bridge was well into the 64-bit era. Even when that was
> new, you wouldn't have run a 32-bit kernel on it (or cared
> about CPU optimizations if you did). For x86-64 there is no
> CPU selection and we just always build with -mtune=generic.
> This works well with any out-of-order microarchitecture.
For some reason I was thinking the same mtune list would apply to 64bit
(even though some would clearly be pointless).
I probably got fooled by you saying that the other ten are aliases.
-- David
>
> Arnd
prev parent reply other threads:[~2026-05-23 10:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 14:19 [PATCH 0/8] x86-32 CPU configuration cleanups Arnd Bergmann
2026-05-22 14:19 ` [PATCH 1/8] x86: remove ts5500 platforms support Arnd Bergmann
2026-06-01 8:31 ` Geert Uytterhoeven
2026-06-01 12:27 ` Arnd Bergmann
2026-05-22 14:19 ` [PATCH 2/8] x86: remove AMD Élan remnants Arnd Bergmann
2026-05-22 14:19 ` [PATCH 3/8] x86: make TSC usage unconditional Arnd Bergmann
2026-05-22 16:11 ` Brian Gerst
2026-05-22 14:19 ` [PATCH 4/8] x86: make CX8 " Arnd Bergmann
2026-05-22 14:19 ` [PATCH 5/8] x86: remove dependencies on CONFIG_M... CPU options Arnd Bergmann
2026-05-22 15:46 ` Juergen Gross
2026-05-22 18:54 ` Arnd Bergmann
2026-05-22 19:00 ` Jürgen Groß
2026-05-22 21:22 ` David Laight
2026-05-22 14:19 ` [PATCH 6/8] x86: require minimum 64 byte cache lines Arnd Bergmann
2026-05-22 14:19 ` [PATCH 7/8] x86: remove dependencies on per-CPU options Arnd Bergmann
2026-05-22 14:19 ` [PATCH 8/8] x86: simplify 32-bit instruction set selection Arnd Bergmann
2026-05-22 21:33 ` David Laight
2026-05-23 8:51 ` Arnd Bergmann
2026-05-23 10:02 ` David Laight [this message]
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