From: Bastian Blank <bastian@waldi.eu.org>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
linux-arch@vger.kernel.org,
Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: [patch 2/2] introduce vdso on s390
Date: Fri, 17 Oct 2008 17:34:36 +0200 [thread overview]
Message-ID: <20081017153436.GA17116@wavehammer.waldi.eu.org> (raw)
In-Reply-To: <20081015175305.332585239@de.ibm.com>
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
next prev parent reply other threads:[~2008-10-17 15:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-15 17:45 [patch 0/2] vdso support for s390 Martin Schwidefsky
2008-10-15 17:45 ` [patch 1/2] arch_setup_additional_pages arguments Martin Schwidefsky
2008-10-15 17:45 ` [patch 2/2] introduce vdso on s390 Martin Schwidefsky
2008-10-17 15:34 ` Bastian Blank [this message]
2008-10-20 13:06 ` Heiko Carstens
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