linux-kernel - Re: [PATCH 2/6] module: add support for symbol namespaces.

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Message-ID: <CAB0TPYHu2tDuefRCfdUd_A8XqRQ_ym811ua-Cu3C=xUPnyHTGw@mail.gmail.com>
Date:   Tue, 24 Jul 2018 09:44:25 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     Jessica Yu <jeyu@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Sam Ravnborg <sam@...nborg.org>, linux-kbuild@...r.kernel.org,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        USB list <linux-usb@...r.kernel.org>,
        USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
        linux-scsi@...r.kernel.org,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Martijn Coenen <maco@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Iliyan Malchev <malchev@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [PATCH 2/6] module: add support for symbol namespaces.

On Mon, Jul 23, 2018 at 1:12 PM, Jessica Yu <jeyu@...nel.org> wrote:
> IMO I don't think we should bend over backwards to accommodate
> out-of-tree modules - modifying the module loader to recognize even
> more special sections to accommodate these OOT modules would be where
> we'd draw the line I think.

I agree with you, I really don't like making the module loader more
complex (which is why I didn't opt to create separate sections in the
first place), and in the end this change will in some ways benefit
out-of-tree drivers too, even though it will be a bit painful now.

> I think going forward I would prefer to have export namespaces to be a
> normal and regular part of kernel API (as in, we shouldn't require a
> new option for it), and that the warnings for 1-2 cycles are courteous
> enough - but anyone with stronger opinions about this should speak up.

That aligns with how I think about this; if we want this to be a
standard thing in the kernel, we should at some point enforce it,
because it's pretty easy to ignore the warning. The good thing is that
it's not a big on/off switch, but subsystem maintainers can just
introduce namespaces when it makes sense.

Thanks,
Martijn

>
> Thanks,
>
> Jessica