linux-kernel - Re: [PATCH 2/2] rust: block: fix wrong usage of lockdep API

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Message-ID: <34282f40-d6a1-4354-8fd5-24239ada15ed@proton.me>
Date: Fri, 16 Aug 2024 15:59:10 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Andreas Hindborg <nmi@...aspace.dk>, Jens Axboe <axboe@...nel.dk>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>
Cc: Andreas Hindborg <a.hindborg@...sung.com>, "Behme Dirk (XC-CP/ESB5)" <Dirk.Behme@...bosch.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Alice Ryhl <aliceryhl@...gle.com>, "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] rust: block: fix wrong usage of lockdep API

On 15.08.24 09:49, Andreas Hindborg wrote:
> From: Andreas Hindborg <a.hindborg@...sung.com>
> 
> When allocating `struct gendisk`, `GenDiskBuilder` is using a dynamic lock
> class key without registering the key. This is incorrect use of the API,
> which causes a `WARN` trace. This patch fixes the issue by using a static
> lock class key, which is more appropriate for the situation anyway.
> 
> Fixes: 3253aba3408a ("rust: block: introduce `kernel::block::mq` module")
> Reported-by: "Behme Dirk (XC-CP/ESB5)" <Dirk.Behme@...bosch.com>
> Closes: https://rust-for-linux.zulipchat.com/#narrow/stream/288089-General/topic/6.2E11.2E0-rc1.3A.20rust.2Fkernel.2Fblock.2Fmq.2Ers.3A.20doctest.20lock.20warning
> Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
> ---
>  rust/kernel/block/mq/gen_disk.rs | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Reviewed-by: Benno Lossin <benno.lossin@...ton.me>

---
Cheers,
Benno