linux-kernel - Re: [PATCH RFC 2/8] clock device: convert clock

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Date:	Tue, 9 Nov 2010 11:26:41 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Lameter <cl@...ux.com>,
	John Stultz <johnstul@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH RFC 2/8] clock device: convert clock_gettime

On Mon, Nov 08, 2010 at 07:56:50AM +0100, Arnd Bergmann wrote:
> On Thursday 04 November 2010, Richard Cochran wrote:
> >  #define CPUCLOCK_PERTHREAD_MASK	4
> >  #define CPUCLOCK_WHICH(clock)	((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
> >  #define CPUCLOCK_CLOCK_MASK	3
> > @@ -28,12 +40,17 @@ struct cpu_timer_list {
> >  #define CPUCLOCK_VIRT		1
> >  #define CPUCLOCK_SCHED		2
> >  #define CPUCLOCK_MAX		3
> > +#define CLOCKFD			CPUCLOCK_MAX
> > +#define CLOCKFD_MASK		(CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
> 
> It looks like you are turning a kernel internal interface into a user ABI,
> which I think is highly questionable. Using the bits like this internally is
> ok, but making it part of the syscall ABI means that we can never change this
> in the future.

This set of defines is already part of the ABI and has been copied
into glibc.  I am extending the (mis)use of the clock id by adding one
more case.

Richard


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