linux-kernel - [PATCH] scripts: rust: drop is_rust

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Message-Id: <20230407070517.204676-1-andrea.righi@canonical.com>
Date:   Fri,  7 Apr 2023 09:05:17 +0200
From:   Andrea Righi <andrea.righi@...onical.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
        Eric Curtin <ecurtin@...hat.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Neal Gompa <neal@...pa.dev>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        rust-for-linux@...r.kernel.org, linux-kbuild@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] scripts: rust: drop is_rust_module.sh

Commit c1177979af9c ("btf, scripts: Exclude Rust CUs with pahole")
introduced the constraint "!DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE"
to enable RUST.

With this constraint we don't need is_rust_module.sh anymore, because
'pahole --lang_exclude=rust' already has the capability to exclude Rust
CUs. If pahole isn't recent enough (< 1.24) to support --lang_exclude,
then DEBUG_INFO_BTF can't be enabled with RUST and is_rust_module.sh
isn't used as well.

In any case is_rust_module.sh is obsolete and we can just drop it.

Link: https://lore.kernel.org/lkml/Y+p2xKIN6TJnQinK@righiandr-XPS-13-7390/
Signed-off-by: Andrea Righi <andrea.righi@...onical.com>
---
 rust/macros/module.rs     |  2 +-
 scripts/Makefile.modfinal |  2 --
 scripts/is_rust_module.sh | 16 ----------------
 3 files changed, 1 insertion(+), 19 deletions(-)
 delete mode 100755 scripts/is_rust_module.sh

diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index a7e363c2b044..608406f33a70 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -179,7 +179,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             /// Used by the printing macros, e.g. [`info!`].
             const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
 
-            /// The \"Rust loadable module\" mark, for `scripts/is_rust_module.sh`.
+            /// The \"Rust loadable module\" mark.
             //
             // This may be best done another way later on, e.g. as a new modinfo
             // key or a new section. For the moment, keep it simple.
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 4703f652c009..e6f8fa3c9b8d 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -41,8 +41,6 @@ quiet_cmd_btf_ko = BTF [M] $@
       cmd_btf_ko = 							\
 	if [ ! -f vmlinux ]; then					\
 		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
-	elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then 		\
-		printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
 	else								\
 		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
 		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
diff --git a/scripts/is_rust_module.sh b/scripts/is_rust_module.sh
deleted file mode 100755
index 28b3831a7593..000000000000
--- a/scripts/is_rust_module.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-#
-# is_rust_module.sh module.ko
-#
-# Returns `0` if `module.ko` is a Rust module, `1` otherwise.
-
-set -e
-
-# Using the `16_` prefix ensures other symbols with the same substring
-# are not picked up (even if it would be unlikely). The last part is
-# used just in case LLVM decides to use the `.` suffix.
-#
-# In the future, checking for the `.comment` section may be another
-# option, see https://github.com/rust-lang/rust/pull/97550.
-${NM} "$*" | grep -qE '^[0-9a-fA-F]+ r _R[^[:space:]]+16___IS_RUST_MODULE[^[:space:]]*$'
-- 
2.39.2