From: Tom Rini <trini@kernel•crashing.org>
To: Hollis Blanchard <hollis@austin•ibm.com>
Cc: Todd Poynor <tpoynor@mvista•com>,
devel list <linuxppc-dev@lists•linuxppc.org>
Subject: Re: RFC: 405LP sleep
Date: Mon, 23 Dec 2002 08:03:42 -0700 [thread overview]
Message-ID: <20021223150342.GA15397@opus.bloom.county> (raw)
In-Reply-To: <1040427074.1095.23.camel@granite.austin.ibm.com>
On Fri, Dec 20, 2002 at 05:31:14PM -0600, Hollis Blanchard wrote:
> On Thu, 2002-12-19 at 15:36, Todd Poynor wrote:
>
> > + jiffies += rtc_secs_elapsed * HZ;
> >
> > If jiffies is jumped forward then can kernel events (such as those
> > waiting on a kernel timer) be missed?
>
> I certainly *hope* the check is >= rather than == ... :)
They all should in fact be using time_after(...) or so, to deal
correctly with a jiffies wrap. But from what I recall of doing a
massive kick of the jiffies (to test some jiffies wrap thing) in early
2.4 I believe, things can become somewhat unhappy. Think of a device
which happens to be 'sleeping' while the user is on vacation or so.
--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2002-12-23 15:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-19 20:41 RFC: 405LP sleep Hollis Blanchard
2002-12-19 21:36 ` Todd Poynor
2002-12-20 23:31 ` Hollis Blanchard
2002-12-23 15:03 ` Tom Rini [this message]
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