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kbuild: rust: remove unneeded `@rustc_cfg` to avoid ICE 

commit 50cfe93b01 upstream.

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: a66d733da8 ("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]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240422091215.526688-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miguel Ojeda 2024-04-22 11:12:15 +02:00 committed by Greg Kroah-Hartman
parent 3a93374596
commit 2eed4381ee
1 changed files with 0 additions and 1 deletions
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rust/Makefile
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@ -173,7 +173,6 @@ quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \ mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
OBJTREE=$(abspath $(objtree)) \ OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) --test $(rust_flags) \ $(RUSTDOC) --test $(rust_flags) \
@$(objtree)/include/generated/rustc_cfg \
-L$(objtree)/$(obj) --extern alloc --extern kernel \ -L$(objtree)/$(obj) --extern alloc --extern kernel \
--extern build_error --extern macros \ --extern build_error --extern macros \
--extern bindings --extern uapi \ --extern bindings --extern uapi \