Received-SPF: pass (google.com: domain of linux-kernel+bounces-153071-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: Miguel Ojeda <ojeda@kernel.org>
To: Masahiro Yamada <masahiroy@kernel.org>,
	Miguel Ojeda <ojeda@kernel.org>,
	Wedson Almeida Filho <wedsonaf@gmail.com>,
	Alex Gaynor <alex.gaynor@gmail.com>
Cc: Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nicolas Schier <nicolas@fjasle.eu>,
	Boqun Feng <boqun.feng@gmail.com>,
	Gary Guo <gary@garyguo.net>,
	=?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= <bjorn3_gh@protonmail.com>,
	Benno Lossin <benno.lossin@proton.me>,
	Andreas Hindborg <a.hindborg@samsung.com>,
	Alice Ryhl <aliceryhl@google.com>,
	David Gow <davidgow@google.com>,
	Brendan Higgins <brendan.higgins@linux.dev>,
	linux-kbuild@vger.kernel.org,
	rust-for-linux@vger.kernel.org,
	kunit-dev@googlegroups.com,
	linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	patches@lists.linux.dev,
	stable@vger.kernel.org
Subject: [PATCH] kbuild: rust: remove unneeded `@rustc_cfg` to avoid ICE
Date: Mon, 22 Apr 2024 11:12:15 +0200
Message-ID: <20240422091215.526688-1-ojeda@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

When KUnit tests are enabled, under very big kernel configurations
(e.g. `allyesconfig`), we can trigger a `rustdoc` ICE [1]:

      RUSTDOC TK rust/kernel/lib.rs
    error: the compiler unexpectedly panicked. this is a bug.

The reason is that this build step has a duplicated `@rustc_cfg` argument,
which contains the kernel configuration, and thus a lot of arguments. The
factor 2 happens to be enough to reach the ICE.

Thus remove the unneeded `@rustc_cfg`. By doing so, we clean up the
command and workaround the ICE.

The ICE has been fixed in the upcoming Rust 1.79 [2].

Cc: stable@vger.kernel.org
Fixes: a66d733da801 ("rust: support running Rust documentation tests as KUnit ones")
Link: https://github.com/rust-lang/rust/issues/122722 [1]
Link: https://github.com/rust-lang/rust/pull/122840 [2]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/Makefile | 1 -
 1 file changed, 1 deletion(-)

diff --git a/rust/Makefile b/rust/Makefile
index 846e6ab9d5a9..86a125c4243c 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -175,7 +175,6 @@ quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
 	mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
 	OBJTREE=$(abspath $(objtree)) \
 	$(RUSTDOC) --test $(rust_flags) \
-		@$(objtree)/include/generated/rustc_cfg \
 		-L$(objtree)/$(obj) --extern alloc --extern kernel \
 		--extern build_error --extern macros \
 		--extern bindings --extern uapi \

base-commit: 4cece764965020c22cff7665b18a012006359095
-- 
2.44.0