Messages in this thread | | | Date | Wed, 21 Mar 2001 10:18:38 -0800 (PST) | From | Nigel Gamble <> | Subject | Re: [PATCH for 2.5] preemptible kernel |
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On Wed, 21 Mar 2001, David S. Miller wrote: > Basically, anything which uses smp_processor_id() would need to > be holding some lock so as to not get pre-empted.
Not necessarily. Another solution for the smp_processor_id() case is to ensure that the task can only be scheduled on the current CPU for the duration that the value of smp_processor_id() is used. Or, if the critical region is very short, to disable interrupts on the local CPU.
Nigel Gamble nigel@nrg.org Mountain View, CA, USA. http://www.nrg.org/
MontaVista Software nigel@mvista.com
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