From 52229ebbe024005e13169c3188f734a6b76e1931 Mon Sep 17 00:00:00 2001 From: Matthew Maurer Date: Wed, 8 Jan 2025 23:35:08 +0000 Subject: [PATCH] rust: Disallow BTF generation with Rust + LTO commit 5daa0c35a1f0e7a6c3b8ba9cb721e7d1ace6e619 upstream. The kernel cannot currently self-parse BTF containing Rust debug information. pahole uses the language of the CU to determine whether to filter out debug information when generating the BTF. When LTO is enabled, Rust code can cross CU boundaries, resulting in Rust debug information in CUs labeled as C. This results in a system which cannot parse its own BTF. Signed-off-by: Matthew Maurer Cc: stable@vger.kernel.org Fixes: c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole") Link: https://lore.kernel.org/r/20250108-rust-btf-lto-incompat-v1-1-60243ff6d820@google.com Signed-off-by: Miguel Ojeda Signed-off-by: Greg Kroah-Hartman --- init/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/init/Kconfig b/init/Kconfig index 2825c8cfde3b..b6786ddc88a8 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1925,7 +1925,7 @@ config RUST depends on !GCC_PLUGINS depends on !RANDSTRUCT depends on !SHADOW_CALL_STACK - depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE + depends on !DEBUG_INFO_BTF || (PAHOLE_HAS_LANG_EXCLUDE && !LTO) help Enables Rust support in the kernel.