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 --- fs/nullfs.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 fs/nullfs.c (limited to 'fs/nullfs.c') diff --git a/fs/nullfs.c b/fs/nullfs.c new file mode 100644 index 000000000..e06352c7b --- /dev/null +++ b/fs/nullfs.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2026 Christian Brauner */ +#include +#include +#include + +#include "mount.h" + +static const struct super_operations nullfs_super_operations = { + .statfs = simple_statfs, +}; + +static int nullfs_fs_fill_super(struct super_block *s, struct fs_context *fc) +{ + struct inode *inode; + + s->s_maxbytes = MAX_LFS_FILESIZE; + s->s_blocksize = PAGE_SIZE; + s->s_blocksize_bits = PAGE_SHIFT; + s->s_magic = NULL_FS_MAGIC; + s->s_op = &nullfs_super_operations; + s->s_export_op = NULL; + s->s_xattr = NULL; + s->s_time_gran = 1; + s->s_d_flags = 0; + + inode = new_inode(s); + if (!inode) + return -ENOMEM; + + /* nullfs is permanently empty... */ + make_empty_dir_inode(inode); + simple_inode_init_ts(inode); + inode->i_ino = 1; + /* ... and immutable. */ + inode->i_flags |= S_IMMUTABLE; + + s->s_root = d_make_root(inode); + if (!s->s_root) + return -ENOMEM; + + return 0; +} + +static int nullfs_fs_get_tree(struct fs_context *fc) +{ + return get_tree_nodev(fc, nullfs_fs_fill_super); +} + +static const struct fs_context_operations nullfs_fs_context_ops = { + .get_tree = nullfs_fs_get_tree, +}; + +static int nullfs_init_fs_context(struct fs_context *fc) +{ + fc->ops = &nullfs_fs_context_ops; + fc->sb_flags |= SB_NOUSER; + fc->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; + return 0; +} + +struct file_system_type nullfs_fs_type = { + .name = "nullfs", + .init_fs_context = nullfs_init_fs_context, + .kill_sb = kill_anon_super, +}; -- cgit v1.3.1