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authorAndrea Righi <andrea.righi@canonical.com>2023-02-10 16:26:22 +0100
committerMiguel Ojeda <ojeda@kernel.org>2023-04-19 19:28:49 +0200
commitccc4505454db10402d5284f22d8b7db62e636fc5 (patch)
treec129f52378adfc669fb60b5903f685c6c9be0656 /scripts
parent1c5f054f0b12875096e339861c7f44a7c952ce56 (diff)
rust: fix regexp in scripts/is_rust_module.sh
nm can use "R" or "r" to show read-only data sections, but scripts/is_rust_module.sh can only recognize "r", so with some versions of binutils it can fail to detect if a module is a Rust module or not. Right now we're using this script only to determine if we need to skip BTF generation (that is disabled globally if CONFIG_RUST is enabled), but it's still nice to fix this script to do the proper job. Moreover, with this patch applied I can also relax the constraint of "RUST depends on !DEBUG_INFO_BTF" and build a kernel with Rust and BTF enabled at the same time (of course BTF generation is still skipped for Rust modules). [ Miguel: The actual reason is likely to be a change on the Rust compiler between 1.61.0 and 1.62.0: echo '#[used] static S: () = ();' | rustup run 1.61.0 rustc --emit=obj --crate-type=lib - && nm rust_out.o echo '#[used] static S: () = ();' | rustup run 1.62.0 rustc --emit=obj --crate-type=lib - && nm rust_out.o Gives: 0000000000000000 r _ZN8rust_out1S17h48027ce0da975467E 0000000000000000 R _ZN8rust_out1S17h58e1f3d9c0e97cefE See https://godbolt.org/z/KE6jneoo4. ] Signed-off-by: Andrea Righi <andrea.righi@canonical.com> Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com> Reviewed-by: Eric Curtin <ecurtin@redhat.com> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/is_rust_module.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
index 28b3831a7593..464761a7cf7f 100755
--- a/scripts/is_rust_module.sh
+++ b/scripts/is_rust_module.sh
@@ -13,4 +13,4 @@ set -e
#
# In the future, checking for the `.comment` section may be another
# option, see https://github.com/rust-lang/rust/pull/97550.
-${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
+${NM} "$*" | grep -qE '^[0-9a-fA-F]+ [Rr] _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'