linux-kernel - [PATCH 16/27] modpost: make multiple export error

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Message-Id: <20220424190811.1678416-17-masahiroy@kernel.org>
Date:   Mon, 25 Apr 2022 04:08:00 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH 16/27] modpost: make multiple export error

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.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 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