kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted

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 <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/net/wireless/wext-compat.h b/net/wireless/wext-compat.h
new file mode 100644
index 000000000..8251ca5df
--- /dev/null
+++ b/net/wireless/wext-compat.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __WEXT_COMPAT
+#define __WEXT_COMPAT
+
+#include <net/iw_handler.h>
+#include <linux/wireless.h>
+
+int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_freq *wextfreq, char *extra);
+int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_freq *freq, char *extra);
+int cfg80211_ibss_wext_siwap(struct net_device *dev,
+			     struct iw_request_info *info,
+			     struct sockaddr *ap_addr, char *extra);
+int cfg80211_ibss_wext_giwap(struct net_device *dev,
+			     struct iw_request_info *info,
+			     struct sockaddr *ap_addr, char *extra);
+int cfg80211_ibss_wext_siwessid(struct net_device *dev,
+				struct iw_request_info *info,
+				struct iw_point *data, char *ssid);
+int cfg80211_ibss_wext_giwessid(struct net_device *dev,
+				struct iw_request_info *info,
+				struct iw_point *data, char *ssid);
+
+int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
+			      struct iw_request_info *info,
+			      struct iw_freq *wextfreq, char *extra);
+int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
+			      struct iw_request_info *info,
+			      struct iw_freq *freq, char *extra);
+int cfg80211_mgd_wext_siwap(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct sockaddr *ap_addr, char *extra);
+int cfg80211_mgd_wext_giwap(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct sockaddr *ap_addr, char *extra);
+int cfg80211_mgd_wext_siwessid(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *data, char *ssid);
+int cfg80211_mgd_wext_giwessid(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *data, char *ssid);
+
+int cfg80211_wext_siwmlme(struct net_device *dev,
+			  struct iw_request_info *info,
+			  union iwreq_data *wrqu, char *extra);
+int cfg80211_wext_siwgenie(struct net_device *dev,
+			   struct iw_request_info *info,
+			   union iwreq_data *wrqu, char *extra);
+
+
+int cfg80211_wext_freq(struct iw_freq *freq);
+
+
+extern const struct iw_handler_def cfg80211_wext_handler;
+#endif /* __WEXT_COMPAT */