From: Johannes Stezenbach <js@linuxtv.org>
To: Jonathan Corbet <corbet@lwn.net>
Cc: Randy Dunlap <randy.dunlap@oracle.com>,
Paul Sokolovsky <pmiscml@gmail.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC/PATCH] doc: volatile considered evil
Date: Wed, 9 May 2007 11:43:05 +0200 [thread overview]
Message-ID: <20070509094305.GC28774@linuxtv.org> (raw)
In-Reply-To: <16987.1178675251@lwn.net>
On Tue, May 08, 2007, Jonathan Corbet wrote:
>
> I just took a shot at turning this into something more like a normal
> document:
>
> http://lwn.net/Articles/233479/
I think the "jiffies variable is special" part misses the
"for stupid legacy reasons" explanation.
According to the other volatile rules one should use
something like that:
extern unsigned long __jiffies;
static inline unsigned long read_ulong(unsigned long *addr)
{
return *(volatile unsigned long *)addr;
}
static inline unsigned long get_jiffies(void)
{
return read_ulong(&__jiffies);
}
But of course changing all references to jiffies in the kernel would
be insane, thus jiffies is special "for stupid legacy reasons".
Right?
Johannes
next prev parent reply other threads:[~2007-05-09 9:43 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-01 5:08 [RFC, PATCH 2/4] SoC base drivers: ASIC3 SoC hardware definitions Paul Sokolovsky
2007-05-01 6:56 ` Andrew Morton
2007-05-01 10:27 ` Alan Cox
2007-05-01 12:04 ` Paul Sokolovsky
2007-05-01 12:21 ` Jamey Hicks
2007-05-08 19:14 ` [RFC/PATCH] doc: volatile considered evil Randy Dunlap
2007-05-08 19:18 ` David Rientjes
2007-05-08 20:00 ` Krzysztof Halasa
2007-05-08 20:20 ` David Rientjes
2007-05-08 23:13 ` Randy Dunlap
2007-05-08 23:54 ` David Rientjes
2007-05-09 0:00 ` Randy Dunlap
2007-05-08 21:05 ` Jeremy Fitzhardinge
2007-05-08 21:10 ` Krzysztof Halasa
2007-05-08 21:16 ` Jeff Garzik
2007-05-08 21:26 ` Randy Dunlap
2007-05-08 21:25 ` Jeff Garzik
2007-05-08 21:20 ` Jeremy Fitzhardinge
2007-05-08 21:27 ` David Rientjes
2007-05-08 21:37 ` Jeremy Fitzhardinge
2007-05-08 21:59 ` David Rientjes
2007-05-08 22:04 ` Jeremy Fitzhardinge
2007-05-08 22:19 ` David Rientjes
2007-05-08 22:29 ` Jeremy Fitzhardinge
2007-05-08 22:35 ` David Rientjes
2007-05-08 23:09 ` Randy Dunlap
2007-05-08 21:29 ` Randy Dunlap
2007-05-08 20:07 ` Satyam Sharma
2007-05-08 23:34 ` [PATCH] " Randy Dunlap
2007-05-09 0:06 ` David Rientjes
2007-05-09 2:08 ` Randy Dunlap
2007-05-09 2:38 ` David Rientjes
2007-05-09 3:15 ` Randy Dunlap
2007-05-09 9:21 ` Alan Cox
2007-05-09 9:26 ` Nick Piggin
2007-05-09 13:31 ` Alan Cox
2007-05-09 10:25 ` David Rientjes
2007-05-09 13:36 ` Alan Cox
2007-05-09 18:41 ` David Rientjes
2007-05-09 20:23 ` Alan Cox
2007-05-09 20:25 ` David Rientjes
2007-05-09 22:47 ` Rob Landley
2007-05-09 8:50 ` Stefan Richter
2007-05-09 15:52 ` Randy Dunlap
2007-05-09 19:04 ` Satyam Sharma
2007-05-09 1:47 ` [RFC/PATCH] " Jonathan Corbet
2007-05-09 9:43 ` Johannes Stezenbach [this message]
2007-05-09 19:34 ` Satyam Sharma
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