diff options
| author | Alan Maguire <alan.maguire@oracle.com> | 2026-10-09 12:23:20 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-10-11 14:18:06 +0000 |
| commit | 672981f4aec1d0131761aec60298312464bd7a50 (patch) | |
| tree | 9325df00e598e7ae4e6c3d2a2b7ddf51212ce863 /kernel/module | |
| parent | aac67645215d5a38cff9f86110b81c220e5e8182 (diff) | |
kbuild, btf: Expose vmlinux inline BTF through sysfs
Expose BTF inline-location information from vmlinux .BTF.inline
sections in /sys/kernel/btf as vmlinux.inline. Embedded vmlinux
inline BTF supports read-only mmap().
Provide runtime support for a module-delivered vmlinux inline BTF
carrier. Its link record binds the carrier module name, BTF size, and
SHA-256 digest to the running kernel before its data is made available
through a lazy vmlinux.inline sysfs attribute. The carrier is handled
before ordinary module BTF registration, so its incidental .BTF data is
not exposed.
Make CONFIG_DEBUG_INFO_BTF_INLINE tristate. When configured as a
module, retain vmlinux final split inline BTF for
btf_vmlinux_inline.ko instead of embedding it in vmlinux.
Reserve .BTF.inline.link in vmlinux and extend the final
resolve_btfids patch pass to bind btf_vmlinux_inline to the raw
vmlinux.BTF.inline payload. This preserves the normal built-in
configuration while allowing the large inline BTF payload to load on
demand.
Normal module inline BTF is handled separately, after its
references have been relocated against the final module BTF.
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261009112324.1442319-4-alan.maguire@oracle.com
Diffstat (limited to 'kernel/module')
| -rw-r--r-- | kernel/module/main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/module/main.c b/kernel/module/main.c index c1b34dc1e89a..5b9eb56164b2 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2723,6 +2723,10 @@ static int find_module_sections(struct module *mod, struct load_info *info) mod->btf_base_data = any_section_objs(info, ".BTF.base", 1, &mod->btf_base_data_size); #endif +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF_INLINE) + mod->btf_inline_data = any_section_objs(info, ".BTF.inline", 1, + &mod->btf_inline_data_size); +#endif #ifdef CONFIG_JUMP_LABEL mod->jump_entries = section_objs(info, "__jump_table", sizeof(*mod->jump_entries), @@ -3177,6 +3181,9 @@ static noinline int do_init_module(struct module *mod) mod->btf_data = NULL; mod->btf_base_data = NULL; #endif +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF_INLINE) + mod->btf_inline_data = NULL; +#endif /* * We want to free module_init, but be aware that kallsyms may be * walking this within an RCU read section. In all the failure paths, we |