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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/