Re: [PATCH] RT: Checks for cmpxchg in get_task_struct_rcu()

Nick Piggin
2005-09-22T03:27:58Z

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.

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