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modpost: make sym_add_exported() always allocate a new symbol 

Currently, sym_add_exported() does not allocate a symbol if the same
name symbol already exists in the hash table.

This does not reflect the real use cases. You can let an external
module override the in-tree one. In this case, the external module
will export the same name symbols as the in-tree one. However,
modpost simply ignores those symbols, then Module.symvers for the
external module loses its symbols.

sym_add_exported() should allocate a new symbol.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
This commit is contained in:
Masahiro Yamada 2022-05-01 17:40:18 +09:00
parent b842271108
commit e76cc48d8e
1 changed files with 4 additions and 6 deletions
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10
scripts/mod/modpost.c
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@ -412,19 +412,17 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
{
struct symbol *s = find_symbol(name);
if (!s) {
s = new_symbol(name, mod, export);
list_add_tail(&s->list, &mod->exported_symbols);
} else if (!external_module || s->module->is_vmlinux ||
s->module == mod) {
if (s && (!external_module || s->module->is_vmlinux || s->module == mod)) {
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;
}
s = new_symbol(name, mod, export);
s->module = mod;
s->export = export;
list_add_tail(&s->list, &mod->exported_symbols);
return s;
}