linux-kernel - Re: [PATCH] rust: slab: add basic slab module

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Message-Id: <DD2URCNO2P88.168J48GHSJRRL@kernel.org>
Date: Fri, 26 Sep 2025 17:55:06 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Vlastimil Babka" <vbabka@...e.cz>
Cc: "Elijah Wright" <git@...jahs.space>, "Miguel Ojeda" <ojeda@...nel.org>,
 "Alex Gaynor" <alex.gaynor@...il.com>, "Boqun Feng" <boqun.feng@...il.com>,
 "Gary Guo" <gary@...yguo.net>, Björn Roy Baron
 <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>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, "Lorenzo Stoakes"
 <lorenzo.stoakes@...cle.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 "Uladzislau Rezki" <urezki@...il.com>, <linux-mm@...ck.org>
Subject: Re: [PATCH] rust: slab: add basic slab module

On Fri Sep 26, 2025 at 5:33 PM CEST, Danilo Krummrich wrote:
> The only thing we need on the Rust side is that existing allocations remain
> valid even if the cache is destroyed. Or the other way around the cache is
> silently kept alive internally.

Or to express it in C code:

	struct kmem_cache *cache = kmem_cache_create();
	struct Foo *foo = kmem_cache_alloc();

	// After this call cache will never be accessed; leaves a zombie cache,
	// since foo is still alive.
	kmem_cache_destroy(cache);

	// This must still be valid.
	foo->bar = 42;

	// Frees foo and causes the "zombie" cache to actually be destroyed.
	kmem_cache_free(foo);