linux-kernel - Re: [RFC/PATCH] posix-timers: make them configurable

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Date:   Tue, 13 Sep 2016 16:57:21 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH] posix-timers: make them configurable

On Fri, 9 Sep 2016, Thomas Gleixner wrote:

> On Thu, 8 Sep 2016, Nicolas Pitre wrote:
> > Small embedded systems typically don't need them.  This removes about
> > 16KB from the kernel binary size on ARM when configured out.  
> > Corresponding syscalls are routed to a stub logging the attempt to
> > use those syscalls which should be enough of a clue if they were 
> > disabled without proper consideration.
> > 
> > Signed-off-by: Nicolas Pitre <nico@...aro.org>
> > 
> > diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
> > index ee3de3421f..00e6098e9a 100644
> > --- a/drivers/ptp/Kconfig
> > +++ b/drivers/ptp/Kconfig
> > @@ -6,7 +6,7 @@ menu "PTP clock support"
> >  
> >  config PTP_1588_CLOCK
> >  	tristate "PTP clock support"
> > -	depends on NET
> > +	depends on NET && POSIX_TIMERS
> >  	select PPS
> >  	select NET_PTP_CLASSIFY
> >  	help
> 
> You forgot CONFIG_TIMERFD ....

Unless I'm mistaken, I don't see anything in timerfd.c that depends on 
the (removed) POSIX timer code.  What am I missing?


Nicolas