linux-kernel - Re: [PATCH -v2 5/7] module: Extend the MODULE

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Message-ID: <20250502131139.GC4198@noisy.programming.kicks-ass.net>
Date: Fri, 2 May 2025 15:11:39 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: mcgrof@...nel.org, x86@...nel.org, hpa@...or.com, petr.pavlu@...e.com,
	samitolvanen@...gle.com, da.gomez@...sung.com, nathan@...nel.org,
	nicolas@...sle.eu, linux-kernel@...r.kernel.org,
	linux-modules@...r.kernel.org, linux-kbuild@...r.kernel.org,
	hch@...radead.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH -v2 5/7] module: Extend the MODULE_ namespace parsing

On Sat, Feb 08, 2025 at 12:45:21AM +0900, Masahiro Yamada wrote:
> On Tue, Dec 3, 2024 at 12:11 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > Instead of only accepting "MODULE_${name}", extend it with a comma
> > separated list of module names and add tail glob support.
> >
> > That is, something like: "MODULE_foo-*,bar" is now possible.
> >
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > ---
> >  kernel/module/main.c  |   39 ++++++++++++++++++++++++++++++++++-----
> >  scripts/mod/modpost.c |   40 ++++++++++++++++++++++++++++++++++------
> >  2 files changed, 68 insertions(+), 11 deletions(-)
> >
> 
> >  static void check_exports(struct module *mod)
> >  {
> >         struct symbol *s, *exp;
> > @@ -1714,7 +1741,8 @@ static void check_exports(struct module
> >
> >                 basename = mod_basename(mod->name);
> >
> > -               if (!contains_namespace(&mod->imported_namespaces, exp->namespace)) {
> > +               if (!module_namespace(exp->namespace, basename) &&
> > +                   !contains_namespace(&mod->imported_namespaces, exp->namespace)) {
> >                         modpost_log(!allow_missing_ns_imports,
> >                                     "module %s uses symbol %s from namespace %s, but does not import it.\n",
> >                                     basename, exp->name, exp->namespace);
> >
> 
> When module_namespace() fails, the following error message is shown:
> 
>   ERROR: modpost: module bar uses symbol foo from namespace
> MODULE_kvm, but does not import it.
> 
> 
> We get a hint from this error message, but the solution
> is not MODULE_IMPORT_NS();
> 
> 'make nsdeps' will try to solve this by adding
> 
>   MODULE_IMPORT_NS("MODULE_kvm");
> 
> Apparently, this does not work.
> 
> Not sure if you want to solve the issue.

Seems unsolvable by construction; so no.