linux-kernel - Re: [PATCH v2] rust: task: mark Task methods inline

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Message-ID: <9a516b5f-8509-4643-9c54-26caadc42348@gmail.com>
Date: Thu, 13 Mar 2025 20:41:13 +0100
From: Christian Schrefl <chrisi.schrefl@...il.com>
To: Panagiotis Foliadis <pfoliadis@...teo.net>,
 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 <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>, Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH v2] rust: task: mark Task methods inline

On 11.03.25 4:05 PM, Panagiotis Foliadis wrote:
> When you build the kernel using the llvm-18.1.3-rust-1.85.0-x86_64
> toolchain provided by kernel.org, the following symbols are generated:
> 
> $ nm vmlinux | grep ' _R'.*Task | rustfilt
> ffffffff817b2d30 T <kernel::task::Task>::get_pid_ns
> ffffffff817b2d50 T <kernel::task::Task>::tgid_nr_ns
> ffffffff817b2c90 T <kernel::task::Task>::current_pid_ns
> ffffffff817b2d00 T <kernel::task::Task>::signal_pending
> ffffffff817b2cc0 T <kernel::task::Task>::uid
> ffffffff817b2ce0 T <kernel::task::Task>::euid
> ffffffff817b2c70 T <kernel::task::Task>::current
> ffffffff817b2d70 T <kernel::task::Task>::wake_up
> ffffffff817b2db0 T <kernel::task::Task as kernel::types::AlwaysRefCounted>::dec_ref
> ffffffff817b2d90 T <kernel::task::Task as kernel::types::AlwaysRefCounted>::inc_ref
> 
> These Rust symbols are trivial wrappers around the C functions
> get_pid_ns, task_tgid_nr_ns, task_active_pid_ns, signal_pending, uid,
> euid, get_current, wake_up, get_task_struct and put_task_struct.It
> doesn't make sense to go through a trivial wrapper for these
> functions, so mark them inline.
> 
> After applying this patch, the above command will produce no output.
> 
> Link: https://github.com/Rust-for-Linux/linux/issues/1145
> Signed-off-by: Panagiotis Foliadis <pfoliadis@...teo.net>
> ---

Reviewed-by: Christian Schrefl <chrisi.schrefl@...il.com>

Cheers
Christian