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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
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.