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linux/tools/objtool
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Miguel Ojeda 0bebfb34a4 objtool/rust: add one more noreturn Rust function 
commit dbdf2a7feb upstream.

Between Rust 1.79 and 1.86, under `CONFIG_RUST_KERNEL_DOCTESTS=y`,
`objtool` may report:

    rust/doctests_kernel_generated.o: warning: objtool:
    rust_doctest_kernel_alloc_kbox_rs_13() falls through to next
    function rust_doctest_kernel_alloc_kvec_rs_0()

(as well as in rust_doctest_kernel_alloc_kvec_rs_0) due to calls to the
`noreturn` symbol:

    core::option::expect_failed

from code added in commits 779db37373 ("rust: alloc: kvec: implement
AsPageIter for VVec") and 671618432f ("rust: alloc: kbox: implement
AsPageIter for VBox").

Thus add the mangled one to the list so that `objtool` knows it is
actually `noreturn`.

This can be reproduced as well in other versions by tweaking the code,
such as the latest stable Rust (1.90.0).

Stable does not have code that triggers this, but it could have it in
the future. Downstream forks could too. Thus tag it for backport.

See commit 56d680dd23 ("objtool/rust: list `noreturn` Rust functions")
for more details.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Cc: stable@vger.kernel.org # Needed in 6.12.y and later.
Link: https://patch.msgid.link/20251020020714.2511718-1-ojeda@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-10-29 14:10:30 +01:00
..
arch objtool/LoongArch: Mark special atomic instruction as INSN_BUG type 2025-09-18 19:43:36 +08:00
Documentation objtool: Fix up some outdated references to ENTRY/ENDPROC 2025-03-25 09:20:27 +01:00
include/objtool objtool: Speed up SHT_GROUP reindexing 2025-05-14 13:09:02 +02:00
.gitignore objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
Build objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
builtin-check.c objtool: Change "warning:" to "error: " for fatal errors 2025-04-01 09:07:13 +02:00
check.c objtool/rust: add one more noreturn Rust function 2025-10-29 14:10:30 +01:00
elf.c objtool: Speed up SHT_GROUP reindexing 2025-05-14 13:09:02 +02:00
Makefile objtool: Hide unnecessary compiler error message 2025-03-12 15:43:38 -07:00
noreturns.h objtool: Add vpanic() to the noreturn list 2025-07-11 14:25:21 -04:00
objtool.c objtool: Change "warning:" to "error: " for fatal errors 2025-04-01 09:07:13 +02:00
orc_dump.c objtool: Change "warning:" to "error: " for fatal errors 2025-04-01 09:07:13 +02:00
orc_gen.c objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
special.c objtool: Change "warning:" to "error: " for fatal errors 2025-04-01 09:07:13 +02:00
sync-check.sh objtool: Add objtool_types.h 2023-03-23 23:18:56 +01:00
weak.c objtool: Ditch subcommands 2022-04-22 12:32:01 +02:00