From: Stephan von Krawczynski <skraw@ithnet.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: manfred@colorfullife.com, tejun@aratech.co.kr,
linux-kernel@vger.kernel.org, zwane@linuxpower.ca
Subject: Re: Possible race condition in i386 global_irq_lock handling.
Date: Thu, 21 Aug 2003 23:48:24 +0200 [thread overview]
Message-ID: <20030821234824.37497c08.skraw@ithnet.com> (raw)
In-Reply-To: <20030821172721.GI29612@dualathlon.random>
> smb_rmb is enough in practice for x86 (in asm-i386), but not the right
> barrier in general because rmb only serializes reads against reads, so
> it would also make little sense while reading the i386 code. here you've
> to serialize a write against a read so it would be misleading unless you
> know exactly the lowlevel implementations of those barriers.
>
> smp_mb() before the while loop should be the correct barrier for all
> archs and the asm generated on x86 will be the same.
>
> alpha, ia64 and x86-64 (and probably others) needs it too.
Can some kind soul please provide me with the needed mini-patch. I would like
to try that on my constantly crashing SMP test box...
Regards,
Stephan
next prev parent reply other threads:[~2003-08-21 21:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-21 17:01 Possible race condition in i386 global_irq_lock handling Manfred Spraul
2003-08-21 17:27 ` Andrea Arcangeli
2003-08-21 21:48 ` Stephan von Krawczynski [this message]
2003-08-21 22:44 ` Andrea Arcangeli
2003-08-22 1:18 ` TeJun Huh
2003-08-22 10:07 ` Stephan von Krawczynski
2003-08-22 16:25 ` Andrea Arcangeli
2003-08-24 3:06 ` TeJun Huh
2003-08-24 22:03 ` Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2003-08-21 8:48 TeJun Huh
2003-08-21 10:07 ` Zwane Mwaikambo
2003-08-21 16:15 ` TeJun Huh
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