From: Jamie Lokier <jamie@shareable.org>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Bill Davidsen <davidsen@tmr.com>, Len Brown <len.brown@intel.com>,
Chris Friesen <cfriesen@nortelnetworks.com>,
Willy Tarreau <willy@w.ods.org>,
"Richard B. Johnson" <root@chaos.analogic.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Arkadiusz Miskiewicz <arekm@pld-linux.org>,
Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
ACPI Developers <acpi-devel@lists.sourceforge.net>
Subject: Re: [ACPI] Re: Linux 2.4.26-rc1 (cmpxchg vs 80386 build)
Date: Wed, 31 Mar 2004 16:02:19 +0100 [thread overview]
Message-ID: <20040331150219.GC18990@mail.shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.55.0403311305000.24584@jurand.ds.pg.gda.pl>
Maciej W. Rozycki wrote:
> Well, "cmpxchg", "xadd", etc. can be easily emulated with an aid of a
> spinlock. With SMP operation included.
Nope. Len Brown wrote:
> Linux uses this locking mechanism to coordinate shared access
> to hardware registers with embedded controllers,
> which is true also on uniprocessors too.
You can't do that with a spinlock. The embedded controllers would
need to know about the spinlock.
-- Jamie
next prev parent reply other threads:[~2004-03-31 15:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <A6974D8E5F98D511BB910002A50A6647615F6939@hdsmsx402.hd.intel.com>
2004-03-29 4:49 ` Linux 2.4.26-rc1 (cmpxchg vs 80386 build) Len Brown
2004-03-29 0:09 ` [ACPI] " Andi Kleen
2004-03-29 5:22 ` Willy Tarreau
2004-03-29 7:01 ` Denis Vlasenko
2004-03-29 19:57 ` Willy Tarreau
2004-03-29 22:07 ` Len Brown
2004-03-30 12:56 ` [ACPI] " Alan Cox
2004-03-30 13:15 ` Richard B. Johnson
2004-03-30 14:22 ` Willy Tarreau
2004-03-30 14:48 ` Richard B. Johnson
2004-03-30 15:09 ` Willy Tarreau
2004-03-30 15:33 ` Richard B. Johnson
2004-03-30 16:14 ` Willy Tarreau
2004-03-30 16:42 ` Chris Friesen
2004-03-30 17:44 ` Len Brown
2004-03-30 18:30 ` Arkadiusz Miskiewicz
2004-03-30 20:05 ` Len Brown
2004-03-30 20:25 ` Arkadiusz Miskiewicz
2004-03-30 21:49 ` Len Brown
2004-03-30 20:08 ` Bill Davidsen
2004-03-31 11:13 ` Maciej W. Rozycki
2004-03-31 13:04 ` Bill Davidsen
2004-03-31 15:02 ` Jamie Lokier [this message]
2004-04-01 12:29 ` Maciej W. Rozycki
2004-04-01 13:17 ` Richard B. Johnson
2004-05-08 10:18 ` Denis Vlasenko
2004-04-01 20:46 ` Len Brown
2004-04-02 10:54 ` Maciej W. Rozycki
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