From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Daniel Walker <dwalker@mvista.com>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] RT: Checks for cmpxchg in get_task_struct_rcu()
Date: Thu, 22 Sep 2005 13:27:56 +1000 [thread overview]
Message-ID: <433224BC.1000904@yahoo.com.au> (raw)
In-Reply-To: <1127355538.8950.1.camel@c-67-188-6-232.hsd1.ca.comcast.net>
Daniel Walker wrote:
> On Thu, 2005-09-22 at 10:59 +1000, Nick Piggin wrote:
>
>
>>You need my atomic_cmpxchg patches that provide an atomic_cmpxchg
>>(and atomic_inc_not_zero) for all architectures.
>>
>
>
> It is racy, but why not just disable preemption ..
>
Well you haven't, that's the point. You *introduce* racy operation.
Anyway, no matter, atomic_cmpxchg will take care of this nicely.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2005-09-22 3:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-21 23:37 [PATCH] RT: Checks for cmpxchg in get_task_struct_rcu() Daniel Walker
2005-09-22 0:59 ` Nick Piggin
2005-09-22 2:18 ` Daniel Walker
2005-09-22 3:27 ` Nick Piggin [this message]
2005-09-22 4:50 ` Daniel Walker
2005-09-22 5:05 ` Nick Piggin
2005-09-26 6:25 ` Ingo Molnar
2005-09-26 14:44 ` Daniel Walker
2005-09-26 6:26 ` Ingo Molnar
2005-09-26 6:39 ` Nick Piggin
2005-09-26 6:48 ` Ingo Molnar
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