From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- io_uring/timeout.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 io_uring/timeout.h (limited to 'io_uring/timeout.h') diff --git a/io_uring/timeout.h b/io_uring/timeout.h new file mode 100644 index 000000000..1620f94dd --- /dev/null +++ b/io_uring/timeout.h @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 + +struct io_timeout_data { + struct io_kiocb *req; + struct hrtimer timer; + ktime_t time; + enum hrtimer_mode mode; + u32 flags; +}; + +__cold void io_flush_timeouts(struct io_ring_ctx *ctx); +struct io_cancel_data; +int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd); +__cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct io_uring_task *tctx, + bool cancel_all); +void io_queue_linked_timeout(struct io_kiocb *req); +void io_disarm_next(struct io_kiocb *req); + +int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_link_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_timeout(struct io_kiocb *req, unsigned int issue_flags); +int io_timeout_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags); -- cgit v1.3.1