linux-kernel - Re: [PATCH 1/4] rust: alloc: replace aligned_size() with Kmalloc::aligned

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Message-Id: <DC0PSDBCPGVO.38EGYXRFQVM8N@kernel.org>
Date: Tue, 12 Aug 2025 22:00:02 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Miguel Ojeda" <miguel.ojeda.sandonis@...il.com>
Cc: <lorenzo.stoakes@...cle.com>, <vbabka@...e.cz>,
 <Liam.Howlett@...cle.com>, <urezki@...il.com>, <ojeda@...nel.org>,
 <alex.gaynor@...il.com>, <boqun.feng@...il.com>, <gary@...yguo.net>,
 <bjorn3_gh@...tonmail.com>, <lossin@...nel.org>, <a.hindborg@...nel.org>,
 <aliceryhl@...gle.com>, <tmgross@...ch.edu>,
 <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
 <tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>,
 <rust-for-linux@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] rust: alloc: replace aligned_size() with
 Kmalloc::aligned_layout()

On Tue Aug 12, 2025 at 9:52 PM CEST, Miguel Ojeda wrote:
> Did this need Cc: stable or was it skipped since it is just extra padding?

I don't think so, it just lead to pad to the alignment for Vmalloc too.

Technically, this makes no difference, since Vmalloc is always PAGE_SIZE aligned
and the size always a multiple of PAGE_SIZE.

However, the patch is a prerequisite for the DRM device fix in patch 2.

- Danilo