linux-kernel - Re: [PATCH 20/23] y2038: move itimer reset into itimer.c

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Date:   Thu, 14 Nov 2019 11:51:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ondrej Mosnacek <omosnace@...hat.com>
cc:     Arnd Bergmann <arnd@...db.de>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        John Stultz <john.stultz@...aro.org>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        SElinux list <selinux@...r.kernel.org>
Subject: Re: [PATCH 20/23] y2038: move itimer reset into itimer.c

On Thu, 14 Nov 2019, Ondrej Mosnacek wrote:
> On Mon, Nov 11, 2019 at 11:58 AM Arnd Bergmann <arnd@...db.de> wrote:
> > I don't see that as a problem, we rarely put declarations inside of an #ifdef.
> > The main effect that would have is forcing any file that includes linux/time.h
> > to be rebuilt when selinux is turned on or off in the .config.
> 
> OK, but with this patch if someone tries to use the function
> elsewhere, the build will succeed if SELinux is enabled in the config,
> but fail if it isn't.  Is that intended?  I would suggest at least
> clearly documenting it above the declaration that the function isn't
> supposed to be used by new users and doing so will cause build to fail
> under CONFIG_SECURITY_SELINUX=n.

Come on. We have enough functions in the kernel which are only available
under a certain config option and if you (ab)use them elsewhere then the
build fails. So what?

The #ifdef documents the limited scope and intended use clearly. If
something else really needs that function, then removing the #ifdef
shouldn't be rocket science either.

Thanks,

	tglx