linux-kernel - Re: [patch 2/2] introduce vdso on s390

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Message-ID: <20081017153436.GA17116@wavehammer.waldi.eu.org>
Date:	Fri, 17 Oct 2008 17:34:36 +0200
From:	Bastian Blank <bastian@...di.eu.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [patch 2/2] introduce vdso on s390

On Wed, Oct 15, 2008 at 07:45:08PM +0200, Martin Schwidefsky wrote:
> +void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
> +{
> +	if (clock != &clocksource_tod)
> +		return;
> +
> +	/* Make userspace gettimeofday spin until we're done. */
> +	++vdso_data->tb_update_count;
> +	smp_mb();
> +	vdso_data->xtime_tod_stamp = clock->cycle_last;
> +	vdso_data->xtime_clock_sec = xtime.tv_sec;
> +	vdso_data->xtime_clock_nsec = xtime.tv_nsec;
> +	vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
> +	vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
> +	smp_wmb();

Different barriers?

> +	++(vdso_data->tb_update_count);

Why ++(...)?

Bastian

-- 
Either one of us, by himself, is expendable.  Both of us are not.
		-- Kirk, "The Devil in the Dark", stardate 3196.1
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