linux-kernel - [PATCH 0/3] rust: allocator: Vmalloc: Support alignments larger than PAGE

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Message-Id: <cover.1752573305.git.zhuhui@kylinos.cn>
Date: Tue, 15 Jul 2025 17:59:45 +0800
From: Hui Zhu <hui.zhu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	bjorn3_gh@...tonmail.com,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Geliang Tang <geliang@...nel.org>,
	Hui Zhu <zhuhui@...inos.cn>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH 0/3] rust: allocator: Vmalloc: Support alignments larger than PAGE_SIZE

From: Hui Zhu <zhuhui@...inos.cn>

There is a TODO in Vmalloc::realloc "Support alignments larger than
PAGE_SIZE."

These commits make allocator vmalloc support alignments larger than
PAGE_SIZE.
The function vrealloc_align is added to vmalloc.c to support reallocating
aligned vmap pages.
When Vmalloc::realloc intends to reallocate memory aligned beyond PAGE_SIZE,
vrealloc_align should be used instead of vrealloc, thus enabling support
for alignments larger than PAGE_SIZE.
And add a sample to the samples memory allocator usage.

Hui Zhu (3):
  vmalloc: Add vrealloc_align to support allocation of aligned vmap
    pages
  rust: allocator: Vmalloc: Support alignments larger than PAGE_SIZE
  rust: add a sample allocator usage

 include/linux/vmalloc.h        |   5 ++
 mm/vmalloc.c                   |  80 ++++++++++++++++---------
 rust/helpers/vmalloc.c         |   7 +++
 rust/kernel/alloc/allocator.rs |  32 ++++++----
 samples/rust/Kconfig           |  10 ++++
 samples/rust/Makefile          |   1 +
 samples/rust/rust_allocator.rs | 104 +++++++++++++++++++++++++++++++++
 7 files changed, 199 insertions(+), 40 deletions(-)
 create mode 100644 samples/rust/rust_allocator.rs

-- 
2.43.0