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i=samitolvanen@google.com; h=from:subject; bh=iVy3KaQcdoKMOIhykUTdZW6xpEXbbIbDjNSvxjr5gOU=; b=owGbwMvMwCEWxa662nLh8irG02pJDOk3/1t0fswvNypfEroj6v3n5Ie/uEosTm8xKnE6erHuy wflomNTOkpZGMQ4GGTFFFlavq7euvu7U+qrz0USMHNYmUCGMHBxCsBENoozMly47aW7YekU8y1b ruUZ3j542PZ5ZuZM5Wwbu4bDMwTFHacz/A8q4pLzePX56F3+B+8unA6/HDaz07i32PDDb7FK9oS sGl4A X-Mailer: git-send-email 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250318231815.917621-2-samitolvanen@google.com> Subject: [PATCH] rust: kbuild: Don't export __pfx symbols From: Sami Tolvanen To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , "=?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?=" , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross Cc: Sami Tolvanen , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Alice Ryhl --- rust/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rust/Makefile b/rust/Makefile index ea3849eb78f6..eb18b59d4f39 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -332,7 +332,7 @@ $(obj)/bindings/bindings_helpers_generated.rs: private = bindgen_target_extra =3D ; $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers/helpers.c FO= RCE $(call if_changed_dep,bindgen) =20 -rust_exports =3D $(NM) -p --defined-only $(1) | awk '$$2~/(T|R|D|B)/ && $$= 3!~/__cfi/ && $$3!~/__odr_asan/ { printf $(2),$$3 }' +rust_exports =3D $(NM) -p --defined-only $(1) | awk '$$2~/(T|R|D|B)/ && $$= 3!~/__(pfx|cfi|odr_asan)/ { printf $(2),$$3 }' =20 quiet_cmd_exports =3D EXPORTS $@ cmd_exports =3D \ --=20 2.49.0.rc1.451.g8f38331e32-goog