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

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Message-ID: <20090107141025.143158b7@lxorguk.ukuu.org.uk>
Date:	Wed, 7 Jan 2009 14:10:25 +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

> > The RTC stores the CMOS time in MM DD YY HH:MM:SS format.
> 
> Yes, which is perfect for mktime(), which knows about leap seconds and
> so produces the correct time_t.

mktime in the kernel has no knowledge of leap seconds whatsoever. Go read
kernel/time.c

> different understanding.  I thought it was said that there's kernel
> support to handle the leap second flag in NTP's broadcasts, and that
> that was where the bug was.

All the kernel knows how to do is to slew time (in general) and to repeat
or remove one second. It has no knowledge of leap seconds and it doesn't
know how to convert between UTC/TAI/Unix Epoch etc

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