linux-kernel - Re: [PATCH] rust: kbuild: Don't export _

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Message-ID: <Z9qzPGVYaDD-UC5p@google.com>
Date: Wed, 19 Mar 2025 12:06:20 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: 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>, Trevor Gross <tmgross@...ch.edu>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: kbuild: Don't export __pfx symbols

On Tue, Mar 18, 2025 at 11:18:16PM +0000, Sami Tolvanen wrote:
> With CONFIG_PREFIX_SYMBOLS, objtool adds __pfx prefix symbols
> to claim the compiler emitted call padding bytes. When
> CONFIG_X86_KERNEL_IBT is not selected, the symbols are added to
> individual object files and for Rust objects, they end up being
> exported, resulting in warnings with CONFIG_GENDWARFKSYMS as the
> symbols have no debugging information:
> 
> warning: gendwarfksyms: symbol_print_versions: no information for symbol __pfx_rust_helper_put_task_struct
> warning: gendwarfksyms: symbol_print_versions: no information for symbol __pfx_rust_helper_task_euid
> warning: gendwarfksyms: symbol_print_versions: no information for symbol __pfx_rust_helper_readq_relaxed
> ...
> 
> Filter out the __pfx prefix from exported symbols similarly to
> the existing __cfi and __odr_asan prefixes.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

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