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 --- net/dsa/dsa.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 net/dsa/dsa.h (limited to 'net/dsa/dsa.h') diff --git a/net/dsa/dsa.h b/net/dsa/dsa.h new file mode 100644 index 000000000..3cc7823e9 --- /dev/null +++ b/net/dsa/dsa.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef __DSA_H +#define __DSA_H + +#include +#include + +struct dsa_db; +struct dsa_device_ops; +struct dsa_lag; +struct dsa_switch_tree; +struct net_device; +struct work_struct; + +extern struct list_head dsa_tree_list; + +bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b); +bool dsa_schedule_work(struct work_struct *work); +void dsa_lag_map(struct dsa_switch_tree *dst, struct dsa_lag *lag); +void dsa_lag_unmap(struct dsa_switch_tree *dst, struct dsa_lag *lag); +struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst, + const struct net_device *lag_dev); +struct net_device *dsa_tree_find_first_conduit(struct dsa_switch_tree *dst); +int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, + const struct dsa_device_ops *tag_ops, + const struct dsa_device_ops *old_tag_ops); +void dsa_tree_conduit_admin_state_change(struct dsa_switch_tree *dst, + struct net_device *conduit, + bool up); +void dsa_tree_conduit_oper_state_change(struct dsa_switch_tree *dst, + struct net_device *conduit, + bool up); +unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max); +void dsa_bridge_num_put(const struct net_device *bridge_dev, + unsigned int bridge_num); +struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst, + const struct net_device *br); + +#endif -- cgit v1.3.1