The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 5daa0c35a1f0e7a6c3b8ba9cb721e7d1ace6e619 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025031621-july-parkway-796f@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5daa0c35a1f0e7a6c3b8ba9cb721e7d1ace6e619 Mon Sep 17 00:00:00 2001 From: Matthew Maurer mmaurer@google.com Date: Wed, 8 Jan 2025 23:35:08 +0000 Subject: [PATCH] rust: Disallow BTF generation with Rust + LTO

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 mmaurer@google.com 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@g... Signed-off-by: Miguel Ojeda ojeda@kernel.org

diff --git a/init/Kconfig b/init/Kconfig index d0d021b3fa3b..324c2886b2ea 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1973,7 +1973,7 @@ config RUST depends on !MODVERSIONS || GENDWARFKSYMS depends on !GCC_PLUGIN_RANDSTRUCT depends on !RANDSTRUCT - depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE + depends on !DEBUG_INFO_BTF || (PAHOLE_HAS_LANG_EXCLUDE && !LTO) depends on !CFI_CLANG || HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC select CFI_ICALL_NORMALIZE_INTEGERS if CFI_CLANG depends on !CALL_PADDING || RUSTC_VERSION >= 108100