linux-kernel - Re: [PATCH v5 0/4] Align atomic storage

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Message-Id: <20251216114945.df117ce1f176dd7752244cfb@linux-foundation.org>
Date: Tue, 16 Dec 2025 11:49:45 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Finn Thain <fthain@...ux-m68k.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Will Deacon <will@...nel.org>,
 Andrii Nakryiko <andrii@...nel.org>, Arnd Bergmann <arnd@...db.de>, Alexei
 Starovoitov <ast@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
 bpf@...r.kernel.org, Rich Felker <dalias@...c.org>, Daniel Borkmann
 <daniel@...earbox.net>, Dinh Nguyen <dinguyen@...nel.org>, Eduard Zingerman
 <eddyz87@...il.com>, Gary Guo <gary@...yguo.net>, Geert Uytterhoeven
 <geert@...ux-m68k.org>, John Paul Adrian Glaubitz
 <glaubitz@...sik.fu-berlin.de>, Guo Ren <guoren@...nel.org>, Hao Luo
 <haoluo@...gle.com>, John Fastabend <john.fastabend@...il.com>, Jiri Olsa
 <jolsa@...nel.org>, Jonas Bonn <jonas@...thpole.se>, KP Singh
 <kpsingh@...nel.org>, linux-arch@...r.kernel.org,
 linux-csky@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-m68k@...ts.linux-m68k.org, linux-openrisc@...r.kernel.org,
 linux-sh@...r.kernel.org, Mark Rutland <mark.rutland@....com>, Martin KaFai
 Lau <martin.lau@...ux.dev>, Stanislav Fomichev <sdf@...ichev.me>, Stafford
 Horne <shorne@...il.com>, Song Liu <song@...nel.org>, Stefan Kristiansson
 <stefan.kristiansson@...nalahti.fi>, Yonghong Song
 <yonghong.song@...ux.dev>, Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH v5 0/4] Align atomic storage

On Tue, 16 Dec 2025 17:31:05 +1100 Finn Thain <fthain@...ux-m68k.org> wrote:

> This series adds the __aligned attribute to atomic_t and atomic64_t
> definitions in include/linux and include/asm-generic (respectively)
> to get natural alignment of both types on csky, m68k, microblaze,
> nios2, openrisc and sh.
> 
> This series also adds Kconfig options to enable a new run-time warning
> to help reveal misaligned atomic accesses on platforms which don't
> trap that.
> 
> The performance impact is expected to vary across platforms and workloads.
> The measurements I made on m68k show that some workloads run faster and
> others slower.

Looks nice, thanks.

I don't know which tree this is aimed at.  I grabbed a copy for
mm.git's mm-nonmm-unstable tree, can drop it again if this pops up in
linux-next via another route.