linux-kernel - Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Message-ID: <20090107105201.054c011f@lxorguk.ukuu.org.uk>
Date:	Wed, 7 Jan 2009 10:52:01 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Newall <davidn@...idnewall.com>
Cc:	Nick Andrew <nick@...k-andrew.net>,
	Linas Vepstas <linasvepstas@...il.com>, david@...g.hm,
	Kyle Moffett <kyle@...fetthome.net>,
	Ben Goodger <goodgerster@...il.com>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org,
	"Jeffrey J. Kosowsky" <jeff@...owsky.org>,
	MentalMooMan <slashdot@...eshallam.info>,
	Travis Crump <pretzalz@...hhouse.org>, burdell@...ntheinter.net
Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years
 2008-2009

> True but irrelevant because the RTC returns a timestamp.  And it's
> quietly understood that the RTC is only an approximation.

You miss the point.

The RTC stores the CMOS time in MM DD YY HH:MM:SS format. That conversion
is done kernel side when reading/writing the RTC chip. Thus if you are
using leap second timing your BIOS RTC values will not agree with the
expected value.

> However it is now clear that no special kernel support is required for
> leap-seconds, and any such code that's been incorporated needs to be
> removed.  Removed I say!

There never has been any. Its all handled (both posix and sane) by glibc.

Alan
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