linux-kernel - Re: [PATCH v3) posix-timers: make it configurable

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Message-ID: <alpine.LFD.2.20.1609151436000.14769@knanqh.ubzr>
Date:   Thu, 15 Sep 2016 14:37:26 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Josh Triplett <josh@...htriplett.org>,
        Richard Cochran <richardcochran@...il.com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3) posix-timers: make it configurable

On Thu, 15 Sep 2016, John Stultz wrote:

> On Thu, Sep 15, 2016 at 11:28 AM, Nicolas Pitre
> <nicolas.pitre@...aro.org> wrote:
> > On Thu, 15 Sep 2016, John Stultz wrote:
> >
> >> > diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
> >> > index 62824f2fe4..62504a2c9f 100644
> >> > --- a/kernel/time/Kconfig
> >> > +++ b/kernel/time/Kconfig
> >> > @@ -195,3 +195,21 @@ config HIGH_RES_TIMERS
> >> >
> >> >  endmenu
> >> >  endif
> >> > +
> >> > +config POSIX_TIMERS
> >> > +       bool "Posix Clocks & timers" if EMBEDDED
> >> > +       default y
> >> > +       help
> >> > +         This includes native support for POSIX timers to the kernel.
> >> > +         Most embedded systems may have no use for them and therefore they
> >> > +         can be configured out to reduce the size of the kernel image.
> >> > +
> >> > +         When this option is disabled, the following syscalls won't be
> >> > +         available: timer_create, timer_gettime: timer_getoverrun,
> >> > +         timer_settime, timer_delete, clock_adjtime. Furthermore, the
> >> > +         clock_settime, clock_gettime, clock_getres and clock_nanosleep
> >> > +         syscalls will be limited to CLOCK_REALTIME and CLOCK_MONOTONIC
> >> > +         only.
> >> > +
> >> > +         If unsure say y.
> >> >
> >>
> >> One thought.. Should this go under:
> >>     Configure standard kernel features (expert users)
> >> rather then a top level item under  General Setup ?
> >
> > Hmmm... probably yes.
> >
> > Do you need that I repost the patch?
> 
> I can see about moving it..

OK.

Making it conditional on EXPERT rather than EMBEDDED would also be more 
inline with the other similar options there.


Nicolas