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 --- drivers/md/bcache/request.h | 47 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 drivers/md/bcache/request.h (limited to 'drivers/md/bcache/request.h') diff --git a/drivers/md/bcache/request.h b/drivers/md/bcache/request.h new file mode 100644 index 000000000..46bbef00a --- /dev/null +++ b/drivers/md/bcache/request.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHE_REQUEST_H_ +#define _BCACHE_REQUEST_H_ + +struct data_insert_op { + struct closure cl; + struct cache_set *c; + struct bio *bio; + struct workqueue_struct *wq; + + unsigned int inode; + uint16_t write_point; + uint16_t write_prio; + blk_status_t status; + + union { + uint16_t flags; + + struct { + unsigned int bypass:1; + unsigned int writeback:1; + unsigned int flush_journal:1; + unsigned int csum:1; + + unsigned int replace:1; + unsigned int replace_collision:1; + + unsigned int insert_data_done:1; + }; + }; + + struct keylist insert_keys; + BKEY_PADDED(replace_key); +}; + +unsigned int bch_get_congested(const struct cache_set *c); +CLOSURE_CALLBACK(bch_data_insert); + +void bch_cached_dev_request_init(struct cached_dev *dc); +void cached_dev_submit_bio(struct bio *bio); + +void bch_flash_dev_request_init(struct bcache_device *d); +void flash_dev_submit_bio(struct bio *bio); + +extern struct kmem_cache *bch_search_cache; + +#endif /* _BCACHE_REQUEST_H_ */ -- cgit v1.3.1