On Sun, Apr 24, 2022 at 12:09 PM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> This is currently a warning, but I think modpost should stop building
> in this case.
>
> If the same symbol is exported multiple times and we let it keep going,
> the sanity check becomes difficult.
>
> Only the legitimate case is that an external module overrides the
> corresponding in-tree module to provide a different implementation
> with the same interface.
Could the same module export a weak version of a symbol, and a strong one?
Can kernel modules override in-kernel strong symbols?
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
>
> scripts/mod/modpost.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 14044cd94aaa..73f0b98e3b5a 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -411,9 +411,9 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
> list_add_tail(&s->list, &mod->exported_symbols);
> } else if (!external_module || s->module->is_vmlinux ||
> s->module == mod) {
> - warn("%s: '%s' exported twice. Previous export was in %s%s\n",
> - mod->name, name, s->module->name,
> - s->module->is_vmlinux ? "" : ".ko");
> + error("%s: '%s' exported twice. Previous export was in %s%s\n",
> + mod->name, name, s->module->name,
> + s->module->is_vmlinux ? "" : ".ko");
> return s;
> }
>
> --
> 2.32.0
>
--
Thanks,
~Nick Desaulniers
