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, 66 insertions, 0 deletions

diff --git a/drivers/hid/hid-sunplus.c b/drivers/hid/hid-sunplus.c
new file mode 100644
index 000000000..64e4cff8c
--- /dev/null
+++ b/drivers/hid/hid-sunplus.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  HID driver for some sunplus "special" devices
+ *
+ *  Copyright (c) 1999 Andreas Gal
+ *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ *  Copyright (c) 2006-2007 Jiri Kosina
+ *  Copyright (c) 2008 Jiri Slaby
+ */
+
+/*
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+static const __u8 *sp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	if (*rsize >= 112 && rdesc[104] == 0x26 && rdesc[105] == 0x80 &&
+			rdesc[106] == 0x03) {
+		hid_info(hdev, "fixing up Sunplus Wireless Desktop report descriptor\n");
+		rdesc[105] = rdesc[110] = 0x03;
+		rdesc[106] = rdesc[111] = 0x21;
+	}
+	return rdesc;
+}
+
+#define sp_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
+		EV_KEY, (c))
+static int sp_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+		struct hid_field *field, struct hid_usage *usage,
+		unsigned long **bit, int *max)
+{
+	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
+		return 0;
+
+	switch (usage->hid & HID_USAGE) {
+	case 0x2003: sp_map_key_clear(KEY_ZOOMIN);		break;
+	case 0x2103: sp_map_key_clear(KEY_ZOOMOUT);	break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static const struct hid_device_id sp_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_SUNPLUS, USB_DEVICE_ID_SUNPLUS_WDESKTOP) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, sp_devices);
+
+static struct hid_driver sp_driver = {
+	.name = "sunplus",
+	.id_table = sp_devices,
+	.report_fixup = sp_report_fixup,
+	.input_mapping = sp_input_mapping,
+};
+module_hid_driver(sp_driver);
+
+MODULE_DESCRIPTION("HID driver for some sunplus \"special\" devices");
+MODULE_LICENSE("GPL");