linux-kernel - Re: [PATCH v5 1/4] bpf: Explicitly align bpf_res_spin

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Message-Id: <be416313-1f49-4275-80a2-3cb0826a67e9@app.fastmail.com>
Date: Tue, 16 Dec 2025 08:24:03 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Finn Thain" <fthain@...ux-m68k.org>,
 "Peter Zijlstra" <peterz@...radead.org>, "Will Deacon" <will@...nel.org>
Cc: "Andrew Morton" <akpm@...ux-foundation.org>,
 "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
 "Mark Rutland" <mark.rutland@....com>,
 Linux-Arch <linux-arch@...r.kernel.org>, linux-kernel@...r.kernel.org,
 linux-m68k@...ts.linux-m68k.org, "Alexei Starovoitov" <ast@...nel.org>,
 "Daniel Borkmann" <daniel@...earbox.net>,
 "Andrii Nakryiko" <andrii@...nel.org>,
 "Martin KaFai Lau" <martin.lau@...ux.dev>,
 "Eduard Zingerman" <eddyz87@...il.com>, "Song Liu" <song@...nel.org>,
 "Yonghong Song" <yonghong.song@...ux.dev>,
 "John Fastabend" <john.fastabend@...il.com>, "KP Singh" <kpsingh@...nel.org>,
 "Stanislav Fomichev" <sdf@...ichev.me>, "Hao Luo" <haoluo@...gle.com>,
 "Jiri Olsa" <jolsa@...nel.org>, "Geert Uytterhoeven" <geert@...ux-m68k.org>,
 bpf@...r.kernel.org
Subject: Re: [PATCH v5 1/4] bpf: Explicitly align bpf_res_spin_lock

On Tue, Dec 16, 2025, at 07:31, Finn Thain wrote:
> Align bpf_res_spin_lock to avoid a BUILD_BUG_ON() when the alignment
> changes, as it will do on m68k when, in a subsequent patch, the minimum
> alignment of the atomic_t member of struct rqspinlock gets increased
> from 2 to 4. Drop the BUILD_BUG_ON() as it becomes redundant.
>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: linux-m68k@...ts.linux-m68k.org
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> Signed-off-by: Finn Thain <fthain@...ux-m68k.org>

Reviewed-by: Arnd Bergmann <arnd@...db.de>