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 --- include/sound/initval.h | 90 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 include/sound/initval.h (limited to 'include/sound/initval.h') diff --git a/include/sound/initval.h b/include/sound/initval.h new file mode 100644 index 000000000..a1ff3b486 --- /dev/null +++ b/include/sound/initval.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __SOUND_INITVAL_H +#define __SOUND_INITVAL_H + +/* + * Init values for soundcard modules + * Copyright (c) by Jaroslav Kysela + */ + +#define SNDRV_AUTO_PORT 1 +#define SNDRV_AUTO_IRQ 0xffff +#define SNDRV_AUTO_DMA 0xffff +#define SNDRV_AUTO_DMA_SIZE (0x7fffffff) + +#define SNDRV_DEFAULT_IDX1 (-1) +#define SNDRV_DEFAULT_STR1 NULL +#define SNDRV_DEFAULT_ENABLE1 1 +#define SNDRV_DEFAULT_PORT1 SNDRV_AUTO_PORT +#define SNDRV_DEFAULT_IRQ1 SNDRV_AUTO_IRQ +#define SNDRV_DEFAULT_DMA1 SNDRV_AUTO_DMA +#define SNDRV_DEFAULT_DMA_SIZE1 SNDRV_AUTO_DMA_SIZE +#define SNDRV_DEFAULT_PTR1 SNDRV_DEFAULT_STR1 + +#define SNDRV_DEFAULT_IDX { [0 ... (SNDRV_CARDS-1)] = -1 } +#define SNDRV_DEFAULT_STR { [0 ... (SNDRV_CARDS-1)] = NULL } +#define SNDRV_DEFAULT_ENABLE { 1, [1 ... (SNDRV_CARDS-1)] = 0 } +#define SNDRV_DEFAULT_ENABLE_PNP { [0 ... (SNDRV_CARDS-1)] = 1 } +#ifdef CONFIG_PNP +#define SNDRV_DEFAULT_ENABLE_ISAPNP SNDRV_DEFAULT_ENABLE_PNP +#else +#define SNDRV_DEFAULT_ENABLE_ISAPNP SNDRV_DEFAULT_ENABLE +#endif +#define SNDRV_DEFAULT_PORT { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_PORT } +#define SNDRV_DEFAULT_IRQ { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_IRQ } +#define SNDRV_DEFAULT_DMA { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_DMA } +#define SNDRV_DEFAULT_DMA_SIZE { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_DMA_SIZE } +#define SNDRV_DEFAULT_PTR SNDRV_DEFAULT_STR + +#ifdef SNDRV_LEGACY_FIND_FREE_IOPORT +static long snd_legacy_find_free_ioport(const long *port_table, long size) +{ + while (*port_table != -1) { + if (request_region(*port_table, size, "ALSA test")) { + release_region(*port_table, size); + return *port_table; + } + port_table++; + } + return -1; +} +#endif + +#ifdef SNDRV_LEGACY_FIND_FREE_IRQ +#include + +static irqreturn_t snd_legacy_empty_irq_handler(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + +static int snd_legacy_find_free_irq(const int *irq_table) +{ + while (*irq_table != -1) { + if (!request_irq(*irq_table, snd_legacy_empty_irq_handler, + IRQF_PROBE_SHARED, "ALSA Test IRQ", + (void *) irq_table)) { + free_irq(*irq_table, (void *) irq_table); + return *irq_table; + } + irq_table++; + } + return -1; +} +#endif + +#ifdef SNDRV_LEGACY_FIND_FREE_DMA +static int snd_legacy_find_free_dma(const int *dma_table) +{ + while (*dma_table != -1) { + if (!request_dma(*dma_table, "ALSA Test DMA")) { + free_dma(*dma_table); + return *dma_table; + } + dma_table++; + } + return -1; +} +#endif + +#endif /* __SOUND_INITVAL_H */ -- cgit v1.3.1