From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Pavel Machek <pavel@suse.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
mtk.manpages@gmail.com, rdunlap@xenotime.net,
linux-doc@vger.kernel.org
Subject: Re: atomics: document that linux expects certain atomic behaviour from unsigned long
Date: Sat, 3 Jan 2009 20:19:55 +0000 [thread overview]
Message-ID: <20090103201955.186974bb@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090103124400.GA1572@ucw.cz>
On Sat, 3 Jan 2009 13:44:00 +0100
Pavel Machek <pavel@suse.cz> wrote:
> Linux relies on unsigned long to behave like atomic for read/write.
Actually it isn't that simple and this advice shouldn't be given IMHO.
unsigned long is not the same as atomic in several respects including
ordering and caching of the result.
Alan
next prev parent reply other threads:[~2009-01-03 20:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-03 12:44 Pavel Machek
2009-01-03 20:19 ` Alan Cox [this message]
2009-01-03 20:27 ` Pavel Machek
2009-01-03 20:30 ` Alan Cox
2009-01-03 20:56 ` Pavel Machek
2009-01-03 23:01 ` david
2009-01-03 23:14 ` Alan Cox
2009-01-05 10:54 ` Nick Piggin
2009-01-05 11:23 ` Alan Cox
2009-01-05 12:00 ` Nick Piggin
2009-01-05 16:05 ` Paul E. McKenney
2009-01-05 16:25 ` Nick Piggin
2009-01-05 17:30 ` Paul E. McKenney
2009-01-05 18:25 ` Nick Piggin
2009-01-05 22:01 ` Paul E. McKenney
2009-01-03 23:53 ` Robert Hancock
2009-01-04 18:05 ` Tilman Schmidt
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