Date: Fri, 4 Sep 2009 18:25:28 +0200
From: Alessandro Zummo <alessandro.zummo@towertech.it>
To: rtc-linux@googlegroups.com
Cc: mjg@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [rtc-linux] [PATCH 2/2] rtc: Add boot_timesource sysfs
 attribute
Message-ID: <20090904182528.591dbd29@i1501.lan.towertech.it>
In-Reply-To: <1252081568-6000-2-git-send-email-mjg@redhat.com>
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	<1252081568-6000-2-git-send-email-mjg@redhat.com>
Organization: Tower Technologies
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On Fri,  4 Sep 2009 12:26:08 -0400
Matthew Garrett <mjg@redhat.com> wrote:

> CONFIG_RTC_HCTOSYS allows the kernel to read the system time from the RTC
> at boot and resume, avoiding the need for userspace to do so. Unfortunately
> userspace currently has no way to know whether this configuration option
> is enabled and thus cannot sensibly choose whether to run hwclock itself or
> not. Add a boot_timesource sysfs attribute which indicates whether a given
> RTC set the system clock.

 This feature is meant to be in addition of the regular
 hwclock call to read the system time.

 Have you tested if there are drawbacks by not reading it? Like
 TZ, DST and similar?

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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