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, 85 insertions, 0 deletions

diff --git a/include/acpi/acuuid.h b/include/acpi/acuuid.h
new file mode 100644
index 000000000..9ccf5bbaf
--- /dev/null
+++ b/include/acpi/acuuid.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/******************************************************************************
+ *
+ * Name: acuuid.h - ACPI-related UUID/GUID definitions
+ *
+ * Copyright (C) 2000 - 2026, Intel Corp.
+ *
+ *****************************************************************************/
+
+#ifndef __ACUUID_H__
+#define __ACUUID_H__
+
+/*
+ * Note1: UUIDs and GUIDs are defined to be identical in ACPI.
+ *
+ * Note2: This file is standalone and should remain that way.
+ */
+
+/* Controllers */
+
+#define UUID_GPIO_CONTROLLER            "4f248f40-d5e2-499f-834c-27758ea1cd3f"
+#define UUID_USB_CONTROLLER             "ce2ee385-00e6-48cb-9f05-2edb927c4899"
+#define UUID_SATA_CONTROLLER            "e4db149b-fcfe-425b-a6d8-92357d78fc7f"
+
+/* Devices */
+
+#define UUID_PCI_HOST_BRIDGE            "33db4d5b-1ff7-401c-9657-7441c03dd766"
+#define UUID_I2C_DEVICE                 "3cdff6f7-4267-4555-ad05-b30a3d8938de"
+#define UUID_POWER_BUTTON               "dfbcf3c5-e7a5-44e6-9c1f-29c76f6e059c"
+#define UUID_MEMORY_DEVICE              "03b19910-f473-11dd-87af-0800200c9a66"
+#define UUID_GENERIC_BUTTONS_DEVICE     "fa6bd625-9ce8-470d-a2c7-b3ca36c4282e"
+#define UUID_NVDIMM_ROOT_DEVICE         "2f10e7a4-9e91-11e4-89d3-123b93f75cba"
+#define UUID_CONTROL_METHOD_BATTERY     "f18fc78b-0f15-4978-b793-53f833a1d35b"
+
+/* Interfaces */
+
+#define UUID_DEVICE_LABELING            "e5c937d0-3553-4d7a-9117-ea4d19c3434d"
+#define UUID_PHYSICAL_PRESENCE          "3dddfaa6-361b-4eb4-a424-8d10089d1653"
+
+/* TPM */
+#define UUID_HARDWARE_INFORMATION       "cf8e16a5-c1e8-4e25-b712-4f54a96702c8"
+#define UUID_START_METHOD               "6bbf6cab-5463-4714-b7cd-f0203c0368d4"
+#define UUID_MEMORY_CLEAR               "376054ed-cc13-4675-901c-4756d7f2d45d"
+
+/* NVDIMM - NFIT table */
+
+#define UUID_NFIT_DIMM                  "4309ac30-0d11-11e4-9191-0800200c9a66"
+#define UUID_VOLATILE_MEMORY            "7305944f-fdda-44e3-b16c-3f22d252e5d0"
+#define UUID_PERSISTENT_MEMORY          "66f0d379-b4f3-4074-ac43-0d3318b78cdb"
+#define UUID_CONTROL_REGION             "92f701f6-13b4-405d-910b-299367e8234c"
+#define UUID_DATA_REGION                "91af0530-5d86-470e-a6b0-0a2db9408249"
+#define UUID_VOLATILE_VIRTUAL_DISK      "77ab535a-45fc-624b-5560-f7b281d1f96e"
+#define UUID_VOLATILE_VIRTUAL_CD        "3d5abd30-4175-87ce-6d64-d2ade523c4bb"
+#define UUID_PERSISTENT_VIRTUAL_DISK    "5cea02c9-4d07-69d3-269f-4496fbe096f9"
+#define UUID_PERSISTENT_VIRTUAL_CD      "08018188-42cd-bb48-100f-5387d53ded3d"
+#define UUID_NFIT_DIMM_N_MSFT           "1ee68b36-d4bd-4a1a-9a16-4f8e53d46e05"
+#define UUID_NFIT_DIMM_N_HPE1           "9002c334-acf3-4c0e-9642-a235f0d53bc6"
+#define UUID_NFIT_DIMM_N_HPE2           "5008664b-b758-41a0-a03c-27c2f2d04f7e"
+#define UUID_NFIT_DIMM_N_HYPERV         "5746c5f2-a9a2-4264-ad0e-e4ddc9e09e80"
+
+/* Processor Properties (ACPI 6.2) */
+
+#define UUID_CACHE_PROPERTIES           "6DC63E77-257E-4E78-A973-A21F2796898D"
+#define UUID_PHYSICAL_PROPERTY          "DDE4D59A-AA42-4349-B407-EA40F57D9FB7"
+
+/* Modern Standby */
+#define UUID_LPS0_MICROSOFT             "11E00D56-CE64-47CE-837B-1F898F9AA461"
+#define UUID_LPS0_INTEL                 "C4EB40A0-6CD2-11E2-BCFD-0800200C9A66"
+#define UUID_LPS0_AMD                   "E3F32452-FEBC-43CE-9039-932122D37721"
+
+/* Miscellaneous */
+
+#define UUID_PLATFORM_CAPABILITIES      "0811b06e-4a27-44f9-8d60-3cbbc22e7b48"
+#define UUID_DYNAMIC_ENUMERATION        "d8c1a3a6-be9b-4c9b-91bf-c3cb81fc5daf"
+#define UUID_BATTERY_THERMAL_LIMIT      "4c2067e3-887d-475c-9720-4af1d3ed602e"
+#define UUID_THERMAL_EXTENSIONS         "14d399cd-7a27-4b18-8fb4-7cb7b9f4e500"
+#define UUID_DEVICE_PROPERTIES          "daffd814-6eba-4d8c-8a91-bc9bbf4aa301"
+#define UUID_DEVICE_GRAPHS              "ab02a46b-74c7-45a2-bd68-f7d344ef2153"
+#define UUID_HIERARCHICAL_DATA_EXTENSION "dbb8e3e6-5886-4ba6-8795-1319f52a966b"
+#define UUID_CORESIGHT_GRAPH            "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"
+#define UUID_USB4_CAPABILITIES          "23a0d13a-26ab-486c-9c5f-0ffa525a575a"
+#define UUID_1ST_FUNCTION_ID            "893f00a6-660c-494e-bcfd-3043f4fb67c0"
+#define UUID_2ND_FUNCTION_ID            "107ededd-d381-4fd7-8da9-08e9a6c79644"
+#define UUID_FAN_TRIP_POINTS            "a7611840-99fe-41ae-a488-35c75926c8eb"
+#endif				/* __ACUUID_H__ */