linux-kernel - Re: [RFC][PATCH 1/6] x86_64: Enable arch-generic vsyscall support.

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Message-Id: <1155092218.13030.107.camel@cog.beaverton.ibm.com>
Date:	Tue, 08 Aug 2006 19:56:58 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/6] x86_64: Enable arch-generic vsyscall support.

On Wed, 2006-08-09 at 04:29 +0200, Andi Kleen wrote:
> > diff --git a/kernel/timer.c b/kernel/timer.c
> > index b650f04..08b4a02 100644
> > --- a/kernel/timer.c
> > +++ b/kernel/timer.c
> > @@ -1023,6 +1023,12 @@ static int __init timekeeping_init_devic
> >  
> >  device_initcall(timekeeping_init_device);
> >  
> > +#ifdef CONFIG_GENERIC_TIME_VSYSCALL
> > +extern void update_vsyscall(struct timespec* ts, struct clocksource* c);
> > +#else
> > +#define update_vsyscall(now, c)
> > +#endif
> 
> Using a weak dummy function would be a bit cleaner.

Will compilers optimize out the call properly?

Looking at it now, it probably should go in a .h file and the empty
define should be a proper "do { } while(0)" 

thanks
-john


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