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, 171 insertions, 0 deletions

diff --git a/include/uapi/sound/intel/avs/tokens.h b/include/uapi/sound/intel/avs/tokens.h
new file mode 100644
index 000000000..3ff6d9150
--- /dev/null
+++ b/include/uapi/sound/intel/avs/tokens.h
@@ -0,0 +1,171 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright(c) 2021 Intel Corporation
+ *
+ * Authors: Cezary Rojewski <cezary.rojewski@intel.com>
+ *          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
+ */
+
+#ifndef __UAPI_SOUND_INTEL_AVS_TOKENS_H
+#define __UAPI_SOUND_INTEL_AVS_TOKENS_H
+
+enum avs_tplg_token {
+	/* struct avs_tplg */
+	AVS_TKN_MANIFEST_NAME_STRING			= 1,
+	AVS_TKN_MANIFEST_VERSION_U32			= 2,
+	AVS_TKN_MANIFEST_NUM_LIBRARIES_U32		= 3,
+	AVS_TKN_MANIFEST_NUM_AFMTS_U32			= 4,
+	AVS_TKN_MANIFEST_NUM_MODCFGS_BASE_U32		= 5,
+	AVS_TKN_MANIFEST_NUM_MODCFGS_EXT_U32		= 6,
+	AVS_TKN_MANIFEST_NUM_PPLCFGS_U32		= 7,
+	AVS_TKN_MANIFEST_NUM_BINDINGS_U32		= 8,
+	AVS_TKN_MANIFEST_NUM_CONDPATH_TMPLS_U32		= 9,
+	AVS_TKN_MANIFEST_NUM_INIT_CONFIGS_U32		= 10,
+	AVS_TKN_MANIFEST_NUM_NHLT_CONFIGS_U32		= 11,
+
+	/* struct avs_tplg_library */
+	AVS_TKN_LIBRARY_ID_U32				= 101,
+	AVS_TKN_LIBRARY_NAME_STRING			= 102,
+
+	/* struct avs_audio_format */
+	AVS_TKN_AFMT_ID_U32				= 201,
+	AVS_TKN_AFMT_SAMPLE_RATE_U32			= 202,
+	AVS_TKN_AFMT_BIT_DEPTH_U32			= 203,
+	AVS_TKN_AFMT_CHANNEL_MAP_U32			= 204,
+	AVS_TKN_AFMT_CHANNEL_CFG_U32			= 205,
+	AVS_TKN_AFMT_INTERLEAVING_U32			= 206,
+	AVS_TKN_AFMT_NUM_CHANNELS_U32			= 207,
+	AVS_TKN_AFMT_VALID_BIT_DEPTH_U32		= 208,
+	AVS_TKN_AFMT_SAMPLE_TYPE_U32			= 209,
+
+	/* struct avs_tplg_modcfg_base */
+	AVS_TKN_MODCFG_BASE_ID_U32			= 301,
+	AVS_TKN_MODCFG_BASE_CPC_U32			= 302,
+	AVS_TKN_MODCFG_BASE_IBS_U32			= 303,
+	AVS_TKN_MODCFG_BASE_OBS_U32			= 304,
+	AVS_TKN_MODCFG_BASE_PAGES_U32			= 305,
+
+	/* struct avs_tplg_modcfg_ext */
+	AVS_TKN_MODCFG_EXT_ID_U32			= 401,
+	AVS_TKN_MODCFG_EXT_TYPE_UUID			= 402,
+	AVS_TKN_MODCFG_CPR_OUT_AFMT_ID_U32		= 403,
+	AVS_TKN_MODCFG_CPR_FEATURE_MASK_U32		= 404,
+	AVS_TKN_MODCFG_CPR_DMA_TYPE_U32			= 405,
+	AVS_TKN_MODCFG_CPR_DMABUFF_SIZE_U32		= 406,
+	AVS_TKN_MODCFG_CPR_VINDEX_U8			= 407,
+	AVS_TKN_MODCFG_CPR_BLOB_FMT_ID_U32		= 408,
+	AVS_TKN_MODCFG_MICSEL_OUT_AFMT_ID_U32		= 409,
+	AVS_TKN_MODCFG_INTELWOV_CPC_LP_MODE_U32		= 410,
+	AVS_TKN_MODCFG_SRC_OUT_FREQ_U32			= 411,
+	AVS_TKN_MODCFG_MUX_REF_AFMT_ID_U32		= 412,
+	AVS_TKN_MODCFG_MUX_OUT_AFMT_ID_U32		= 413,
+	AVS_TKN_MODCFG_AEC_REF_AFMT_ID_U32		= 414,
+	AVS_TKN_MODCFG_AEC_OUT_AFMT_ID_U32		= 415,
+	AVS_TKN_MODCFG_AEC_CPC_LP_MODE_U32		= 416,
+	AVS_TKN_MODCFG_ASRC_OUT_FREQ_U32		= 417,
+	AVS_TKN_MODCFG_ASRC_MODE_U8			= 418,
+	AVS_TKN_MODCFG_ASRC_DISABLE_JITTER_U8		= 419,
+	AVS_TKN_MODCFG_UPDOWN_MIX_OUT_CHAN_CFG_U32	= 420,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_SELECT_U32	= 421,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_0_S32		= 422,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_1_S32		= 423,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_2_S32		= 424,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_3_S32		= 425,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_4_S32		= 426,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_5_S32		= 427,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_6_S32		= 428,
+	AVS_TKN_MODCFG_UPDOWN_MIX_COEFF_7_S32		= 429,
+	AVS_TKN_MODCFG_UPDOWN_MIX_CHAN_MAP_U32		= 430,
+	AVS_TKN_MODCFG_EXT_NUM_INPUT_PINS_U16		= 431,
+	AVS_TKN_MODCFG_EXT_NUM_OUTPUT_PINS_U16		= 432,
+	AVS_TKN_MODCFG_WHM_REF_AFMT_ID_U32		= 433,
+	AVS_TKN_MODCFG_WHM_OUT_AFMT_ID_U32		= 434,
+	AVS_TKN_MODCFG_WHM_WAKE_TICK_PERIOD_U32		= 435,
+	AVS_TKN_MODCFG_WHM_VINDEX_U8			= 436,
+	AVS_TKN_MODCFG_WHM_DMA_TYPE_U32			= 437,
+	AVS_TKN_MODCFG_WHM_DMABUFF_SIZE_U32		= 438,
+	AVS_TKN_MODCFG_WHM_BLOB_AFMT_ID_U32		= 439,
+	AVS_TKN_MODCFG_PEAKVOL_VOLUME_U32		= 440,
+	AVS_TKN_MODCFG_PEAKVOL_CHANNEL_ID_U32		= 441, /* reserved */
+	AVS_TKN_MODCFG_PEAKVOL_CURVE_TYPE_U32		= 442,
+	AVS_TKN_MODCFG_PEAKVOL_CURVE_DURATION_U32	= 443,
+
+	/* struct avs_tplg_pplcfg */
+	AVS_TKN_PPLCFG_ID_U32				= 1401,
+	AVS_TKN_PPLCFG_REQ_SIZE_U16			= 1402,
+	AVS_TKN_PPLCFG_PRIORITY_U8			= 1403,
+	AVS_TKN_PPLCFG_LOW_POWER_BOOL			= 1404,
+	AVS_TKN_PPLCFG_ATTRIBUTES_U16			= 1405,
+	AVS_TKN_PPLCFG_TRIGGER_U32			= 1406,
+
+	/* struct avs_tplg_binding */
+	AVS_TKN_BINDING_ID_U32				= 1501,
+	AVS_TKN_BINDING_TARGET_TPLG_NAME_STRING		= 1502,
+	AVS_TKN_BINDING_TARGET_PATH_TMPL_ID_U32		= 1503,
+	AVS_TKN_BINDING_TARGET_PPL_ID_U32		= 1504,
+	AVS_TKN_BINDING_TARGET_MOD_ID_U32		= 1505,
+	AVS_TKN_BINDING_TARGET_MOD_PIN_U8		= 1506,
+	AVS_TKN_BINDING_MOD_ID_U32			= 1507,
+	AVS_TKN_BINDING_MOD_PIN_U8			= 1508,
+	AVS_TKN_BINDING_IS_SINK_U8			= 1509,
+
+	/* struct avs_tplg_pipeline */
+	AVS_TKN_PPL_ID_U32				= 1601,
+	AVS_TKN_PPL_PPLCFG_ID_U32			= 1602,
+	AVS_TKN_PPL_NUM_BINDING_IDS_U32			= 1603,
+	AVS_TKN_PPL_BINDING_ID_U32			= 1604,
+
+	/* struct avs_tplg_module */
+	AVS_TKN_MOD_ID_U32				= 1701,
+	AVS_TKN_MOD_MODCFG_BASE_ID_U32			= 1702,
+	AVS_TKN_MOD_IN_AFMT_ID_U32			= 1703,
+	AVS_TKN_MOD_CORE_ID_U8				= 1704,
+	AVS_TKN_MOD_PROC_DOMAIN_U8			= 1705,
+	AVS_TKN_MOD_MODCFG_EXT_ID_U32			= 1706,
+	AVS_TKN_MOD_KCONTROL_ID_U32			= 1707,
+	AVS_TKN_MOD_INIT_CONFIG_NUM_IDS_U32		= 1708,
+	AVS_TKN_MOD_INIT_CONFIG_ID_U32			= 1709,
+	AVS_TKN_MOD_NHLT_CONFIG_ID_U32			= 1710,
+
+	/* struct avs_tplg_path_template */
+	AVS_TKN_PATH_TMPL_ID_U32			= 1801,
+
+	/* struct avs_tplg_path */
+	AVS_TKN_PATH_ID_U32				= 1901,
+	AVS_TKN_PATH_FE_FMT_ID_U32			= 1902,
+	AVS_TKN_PATH_BE_FMT_ID_U32			= 1903,
+
+	/* struct avs_tplg_path_template (conditional) */
+	AVS_TKN_CONDPATH_TMPL_ID_U32			= 1801,
+	AVS_TKN_CONDPATH_TMPL_SOURCE_TPLG_NAME_STRING	= 2002,
+	AVS_TKN_CONDPATH_TMPL_SOURCE_PATH_TMPL_ID_U32	= 2003,
+	AVS_TKN_CONDPATH_TMPL_SINK_TPLG_NAME_STRING	= 2004,
+	AVS_TKN_CONDPATH_TMPL_SINK_PATH_TMPL_ID_U32	= 2005,
+	AVS_TKN_CONDPATH_TMPL_COND_TYPE_U32		= 2006,
+	AVS_TKN_CONDPATH_TMPL_OVERRIDABLE_BOOL		= 2007,
+	AVS_TKN_CONDPATH_TMPL_PRIORITY_U8		= 2008,
+
+	/* struct avs_tplg_path (conditional) */
+	AVS_TKN_CONDPATH_ID_U32				= 1901,
+	AVS_TKN_CONDPATH_SOURCE_PATH_ID_U32		= 2102,
+	AVS_TKN_CONDPATH_SINK_PATH_ID_U32		= 2103,
+
+	/* struct avs_tplg_pin_format */
+	AVS_TKN_PIN_FMT_INDEX_U32			= 2201,
+	AVS_TKN_PIN_FMT_IOBS_U32			= 2202,
+	AVS_TKN_PIN_FMT_AFMT_ID_U32			= 2203,
+
+	/* struct avs_tplg_kcontrol */
+	AVS_TKN_KCONTROL_ID_U32				= 2301,
+
+	/* struct avs_tplg_init_config */
+	AVS_TKN_INIT_CONFIG_ID_U32			= 2401,
+	AVS_TKN_INIT_CONFIG_PARAM_U8			= 2402,
+	AVS_TKN_INIT_CONFIG_LENGTH_U32			= 2403,
+
+	/* struct avs_tplg_nhlt_config */
+	AVS_TKN_NHLT_CONFIG_ID_U32			= 2501,
+	AVS_TKN_NHLT_CONFIG_SIZE_U32			= 2502,
+};
+
+#endif