linux-kernel - Re: [PATCH v2] rust: file: optimize rust symbol generation for FileDescriptorReservation

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Message-ID: <Z9f4Twvl-UaX1NQp@google.com>
Date: Mon, 17 Mar 2025 10:24:15 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Kunwu Chan <kunwu.chan@...ux.dev>, Christian Brauner <brauner@...nel.org>
Cc: ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com, 
	gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, 
	a.hindborg@...nel.org, tmgross@...ch.edu, dakr@...nel.org, nathan@...nel.org, 
	nick.desaulniers+lkml@...il.com, morbo@...gle.com, justinstitt@...gle.com, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, Kunwu Chan <kunwu.chan@...mail.com>, 
	Grace Deng <Grace.Deng006@...il.com>
Subject: Re: [PATCH v2] rust: file: optimize rust symbol generation for FileDescriptorReservation

Adding Christian Brauner who originally merged the
rust/kernel/fs/file.rs file.

On Mon, Mar 17, 2025 at 10:37:02AM +0800, Kunwu Chan wrote:
> From: Kunwu Chan <kunwu.chan@...mail.com>
> 
> When build the kernel using the llvm-18.1.3-rust-1.85.0-x86_64
> with ARCH=arm64, the following symbols are generated:
> 
> $ nm vmlinux | grep ' _R'.*FileDescriptorReservation | rustfilt
> ... T <kernel::fs::file::FileDescriptorReservation>::fd_install
> ... T <kernel::fs::file::FileDescriptorReservation>::get_unused_fd_flags
> ... T <kernel::fs::file::FileDescriptorReservation as core::ops::drop::Drop>::drop
> 
> These Rust symbols are trivial wrappers around the C functions
> fd_install, put_unused_fd and put_task_struct. It
> doesn't make sense to go through a trivial wrapper for these
> functions, so mark them inline.
> 
> Link: https://github.com/Rust-for-Linux/linux/issues/1145
> Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
> Co-developed-by: Grace Deng <Grace.Deng006@...il.com>
> Signed-off-by: Grace Deng <Grace.Deng006@...il.com>
> Signed-off-by: Kunwu Chan <kunwu.chan@...mail.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>