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

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Message-Id: <DD2YPPZ08RMC.2FCYC3HPWY3IC@kernel.org>
Date: Fri, 26 Sep 2025 21:01:02 +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 7:11 PM CEST, Vlastimil Babka wrote:
> The rust wrapper side could do that so we don't have to add that check in
> all kmem_cache_free() calls, maybe?
> Also either way it could perhaps be difficult/expensive (memory barriers
> etc) to properly handle a racing kmem_cache_free() and kmem_cache_destroy()
> in a way that ensures the cache is always being destroyed, and not have the
> kmem_cache_destroy() observe the destroy was premature, while the racing
> kmem_cache_free() doesn't yet observe that destroy was attempted, and not
> try to remove it.

Yeah, it's probably not much better than just using a reference count, but more
error prone.