linux-kernel - Re: [PATCH v2 04/12] rust: init: wrap type checking struct initializers in a closure

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Message-ID: <ae33f931-e5e2-8e62-3d1d-b3bab83829d8@gmail.com>
Date:   Wed, 19 Jul 2023 16:05:57 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Benno Lossin <benno.lossin@...ton.me>,
        Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Andreas Hindborg <nmi@...aspace.dk>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/12] rust: init: wrap type checking struct
 initializers in a closure

On 7/19/23 11:20, Benno Lossin wrote:
> In the implementation of the init macros there is a `if false` statement
> that type checks the initializer to ensure every field is initialized.
> Since the next patch has a stack variable to store the struct, the
> function might allocate too much memory on debug builds. Putting the
> struct into a closure that is never executed ensures that even in debug
> builds no stack overflow error is caused. In release builds this was not
> a problem since the code was optimized away due to the `if false`.
> 
> Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
> ---
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>