linux-5.16> find . -type f -name "*.rs"

Ничего нет.

linux-5.16> grep -r "\brust\b" .

./tools/perf/util/Build:perf-y += demangle-rust.o
./tools/perf/util/demangle-rust.c:#include "demangle-rust.h"
./tools/perf/util/demangle-rust.c:                              pr_err("demangle-rust: unexpected escape sequence");
./tools/perf/util/demangle-rust.c:                      pr_err("demangle-rust: unexpected character '%c' in symbol\n",
./tools/perf/util/symbol-elf.c:#include "demangle-rust.h"
./Documentation/translations/zh_TW/index.rst:* rust/index
./Documentation/translations/zh_CN/doc-guide/kernel-doc.rst:.. note:: kernel-doc无法包含Rust代码:请参考 Documentation/rust/docs.rst 。
./Documentation/translations/zh_CN/index.rst:* rust/index
./Documentation/admin-guide/kernel-parameters.txt:                      with rotating-rust storage.
Какой-то мусор на китайском.