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/net/ax88796.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 include/net/ax88796.h (limited to 'include/net/ax88796.h') diff --git a/include/net/ax88796.h b/include/net/ax88796.h new file mode 100644 index 000000000..303100f08 --- /dev/null +++ b/include/net/ax88796.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* include/net/ax88796.h + * + * Copyright 2005 Simtec Electronics + * Ben Dooks +*/ + +#ifndef __NET_AX88796_PLAT_H +#define __NET_AX88796_PLAT_H + +#include + +struct sk_buff; +struct net_device; +struct platform_device; + +#define AXFLG_HAS_EEPROM (1<<0) +#define AXFLG_MAC_FROMDEV (1<<1) /* device already has MAC */ +#define AXFLG_HAS_93CX6 (1<<2) /* use eeprom_93cx6 driver */ +#define AXFLG_MAC_FROMPLATFORM (1<<3) /* MAC given by platform data */ + +struct ax_plat_data { + unsigned int flags; + unsigned char wordlength; /* 1 or 2 */ + unsigned char dcr_val; /* default value for DCR */ + unsigned char rcr_val; /* default value for RCR */ + unsigned char gpoc_val; /* default value for GPOC */ + u32 *reg_offsets; /* register offsets */ + u8 *mac_addr; /* MAC addr (only used when + AXFLG_MAC_FROMPLATFORM is used */ + + /* uses default ax88796 buffer if set to NULL */ + void (*block_output)(struct net_device *dev, int count, + const unsigned char *buf, int star_page); + void (*block_input)(struct net_device *dev, int count, + struct sk_buff *skb, int ring_offset); + /* returns nonzero if a pending interrupt request might be caused by + * the ax88796. Handles all interrupts if set to NULL + */ + int (*check_irq)(struct platform_device *pdev); +}; + +/* exported from ax88796.c for xsurf100.c */ +extern void ax_NS8390_reinit(struct net_device *dev); + +#endif /* __NET_AX88796_PLAT_H */ -- cgit v1.3.1