linux-kernel - Re: [RFC v2 3/3] atomic: Add alignment check to instrumented atomic operations

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Message-ID: <877bxx10ku.fsf@igel.home>
Date: Wed, 17 Sep 2025 18:54:41 +0200
From: Andreas Schwab <schwab@...ux-m68k.org>
To: Brad Boyer <flar@...andria.com>
Cc: Arnd Bergmann <arnd@...db.de>,  Finn Thain <fthain@...ux-m68k.org>,
  Peter Zijlstra <peterz@...radead.org>,  Will Deacon <will@...nel.org>,
  Andrew Morton <akpm@...ux-foundation.org>,  Boqun Feng
 <boqun.feng@...il.com>,  Jonathan Corbet <corbet@....net>,  Mark Rutland
 <mark.rutland@....com>,  linux-kernel@...r.kernel.org,  Linux-Arch
 <linux-arch@...r.kernel.org>,  Geert Uytterhoeven <geert@...ux-m68k.org>,
  linux-m68k@...r.kernel.org
Subject: Re: [RFC v2 3/3] atomic: Add alignment check to instrumented atomic
 operations

On Sep 16 2025, Brad Boyer wrote:

> I believe it depends on the exact CPU. The 68060 user manual has a
> section called "Emulating CAS2 and CAS Misaligned" discussing the
> handling of such instances through software emulation. The 68040
> user manual doesn't have any similar section.

The 68040 still handles them in hardware.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
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