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/crypto/ecc_curve.h | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 include/crypto/ecc_curve.h (limited to 'include/crypto/ecc_curve.h') diff --git a/include/crypto/ecc_curve.h b/include/crypto/ecc_curve.h new file mode 100644 index 000000000..7d90c5e82 --- /dev/null +++ b/include/crypto/ecc_curve.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2021 HiSilicon */ + +#ifndef _CRYTO_ECC_CURVE_H +#define _CRYTO_ECC_CURVE_H + +#include + +/** + * struct ecc_point - elliptic curve point in affine coordinates + * + * @x: X coordinate in vli form. + * @y: Y coordinate in vli form. + * @ndigits: Length of vlis in u64 qwords. + */ +struct ecc_point { + u64 *x; + u64 *y; + u8 ndigits; +}; + +/** + * struct ecc_curve - definition of elliptic curve + * + * @name: Short name of the curve. + * @nbits: The number of bits of a curve. + * @g: Generator point of the curve. + * @p: Prime number, if Barrett's reduction is used for this curve + * pre-calculated value 'mu' is appended to the @p after ndigits. + * Use of Barrett's reduction is heuristically determined in + * vli_mmod_fast(). + * @n: Order of the curve group. + * @a: Curve parameter a. + * @b: Curve parameter b. + */ +struct ecc_curve { + char *name; + u32 nbits; + struct ecc_point g; + u64 *p; + u64 *n; + u64 *a; + u64 *b; +}; + +/** + * ecc_get_curve() - get elliptic curve; + * @curve_id: Curves IDs: + * defined in 'include/crypto/ecdh.h'; + * + * Returns curve if get curve succssful, NULL otherwise + */ +const struct ecc_curve *ecc_get_curve(unsigned int curve_id); + +/** + * ecc_get_curve25519() - get curve25519 curve; + * + * Returns curve25519 + */ +const struct ecc_curve *ecc_get_curve25519(void); + +#endif -- cgit v1.3.1