On 5/9/25 4:17 PM, Josh Poimboeuf wrote:
> In preparation for the objtool klp diff subcommand, define the entry
> size for the __ex_table section in its ELF header. This will allow
> tooling to extract individual entries.
>
> Signed-off-by: Josh Poimboeuf <[email protected]>
> ---
> arch/x86/include/asm/asm.h | 20 ++++++++++++--------
> kernel/extable.c | 2 ++
> 2 files changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
> index f963848024a5..62dff336f206 100644
> --- a/arch/x86/include/asm/asm.h
> +++ b/arch/x86/include/asm/asm.h
> @@ -138,15 +138,17 @@ static __always_inline __pure void *rip_rel_ptr(void *p)
>
> # include <asm/extable_fixup_types.h>
>
> +#define EXTABLE_SIZE 12
>
> + > [ ... snip ... ]
>
EXTABLE_SIZE defined in arch/x86/ ...
> diff --git a/kernel/extable.c b/kernel/extable.c
> index 71f482581cab..0ae3ee2ef266 100644
> --- a/kernel/extable.c
> +++ b/kernel/extable.c
> @@ -55,6 +55,8 @@ const struct exception_table_entry
> *search_exception_tables(unsigned long addr)
> {
> const struct exception_table_entry *e;
>
> + BUILD_BUG_ON(EXTABLE_SIZE != sizeof(struct exception_table_entry));
> +
but referenced in kernel/ where a non-x86 build like ppc64le build won't
know what EXTABLE_SIZE is :(
--
Joe
