From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [Linux-ia64] spin_unlock() problem
Date: Tue, 08 Apr 2003 00:15:51 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590723705436@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590723705414@msgid-missing>
>>>>> On Mon, 7 Apr 2003 16:38:03 -0700, "Chen, Kenneth W" <kenneth.w.chen@intel.com> said:
Ken> To make it to work correctly, I think one needs something like the
Ken> following:
Ken> --- a Mon Apr 7 16:34:51 2003
Ken> +++ b Mon Apr 7 16:35:11 2003
Ken> @@ -3,11 +3,11 @@
Ken> spin_lock(&bleh);
Ken> *a = foo;
Ken> spin_unlock(&bleh);
Ken> - *b = bar;
Ken> + REL_SEMANTICS(*b) = bar;
Ken> }
Ken> cpu2()
Ken> {
Ken> - if (*b = bar)
Ken> + if (ACQ_SEMANTICS(*b) = bar)
Ken> boink(*a);
Ken> }
Which is exactly what "volatile" would do. Unfortunately, this
"trick" works only on ia64, so it does not solve the problem for all
Linux platforms.
--david
prev parent reply other threads:[~2003-04-08 0:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-04 4:51 [Linux-ia64] spin_unlock() problem Jes Sorensen
2003-04-04 5:04 ` Jes Sorensen
2003-04-04 14:43 ` Van Maren, Kevin
2003-04-04 14:49 ` Van Maren, Kevin
2003-04-04 15:13 ` Jes Sorensen
2003-04-07 21:09 ` David Mosberger
2003-04-07 21:14 ` David Mosberger
2003-04-07 22:09 ` Jes Sorensen
2003-04-07 22:18 ` Luck, Tony
2003-04-07 22:58 ` David Mosberger
2003-04-07 23:13 ` Jes Sorensen
2003-04-07 23:30 ` Jim Hull
2003-04-07 23:38 ` Chen, Kenneth W
2003-04-08 0:14 ` David Mosberger
2003-04-08 0:15 ` David Mosberger [this message]
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