linux-kernel - Re: [PATCH] kernel/signal.c: Export symbol __lock_task

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Message-ID: <CAJ1xhMVpJM+CSiA4PgHNbksp1F9MHsKsQO0iBXr4_m7oShj6-A@mail.gmail.com>
Date:   Mon, 22 Jun 2020 11:50:03 +0300
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, oleg@...hat.com,
        ebiederm@...ssion.com, Andrew Morton <akpm@...ux-foundation.org>,
        liuzhiqiang26@...wei.com, joel@...lfernandes.org,
        paulmck@...ux.vnet.ibm.com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] kernel/signal.c: Export symbol __lock_task_sighand

On Mon, Jun 22, 2020 at 11:40 AM Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> On Sun, Jun 21, 2020 at 03:54:37PM +0200, Dominique Martinet wrote:
> > Alexander Kapshuk wrote on Sun, Jun 21, 2020:
> > > Export symbol __lock_task_sighand, so it is accessible from code compiled
> > > as modules.
> > > This fixes the following modpost error:
> > > ERROR: modpost: "__lock_task_sighand" [net/9p/9pnet.ko] undefined!
> >
> > This can't fix something that's not broken (yet)! :)
> >
> > I think it'd make more sense to describe why you think we should export
> > it, rather than describe a precise usecase e.g. justify why this would
> > be interesting to use from modules (e.g. it would help modules like 9p
> > take a lock on the current signal handler safely and cleanly through
> > lock_task_sighand())
> >
> >
> >
> > Christian, Andrew - assuming this passes reviews from someone else I'm
> > not sure how to go forward with this; it'd be simpler for me if I could
> > take it in the 9p tree as I need it for the patch Alexander pointed at,
> > but I'm not normally touching any file outside of the 9p tree.
> > Is it better to let either of you take it normally (I think it'd be
> > you?) and wait for that to land, or can I take it in my tree for the
> > next merge window?
>
> Hm, I don't think the patch is really needed though; see my other mail. :)
>
> Christian

Thanks Oleg and Christian for your feedback.
Based on what you both expressed, my patch that exported
__lock_task_sighand as well as the original patch to address a sparse
warning in net/9p/client.c
should be dropped and the warning considered a false positive.

I'll let Dominique have the final say on this.
Thanks.