Messages in this thread Patch in this message |  | | From | Masahiro Yamada <> | Subject | [PATCH v2 11/26] modpost: make multiple export error | Date | Sun, 1 May 2022 17:40:17 +0900 |
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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.
Also, there exists an upstream example that exploits this feature.
$ make M=tools/testing/nvdimm
... builds tools/testing/nvdimm/libnvdimm.ko. This is a mocked module that overrides the symbols from drivers/nvdimm/libnvdimm.ko.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> ---
Changes in v2: - Add more commit description
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 4ce8d164b8e0..1f01fc942f94 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -417,9 +417,9 @@ 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
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