Messages in this thread | | | Subject | Re: [PATCH][2.5] fix preempt-issues with smp_call_function() | From | Alan Cox <> | Date | 26 Feb 2003 13:39:32 +0000 |
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On Wed, 2003-02-26 at 10:28, Andrew Morton wrote: > Dave Jones <davej@codemonkey.org.uk> wrote: > > > > btw, (unrelated) shouldn't smp_call_function be doing magick checks > > with cpu_online() ? > > Looks OK? It sprays the IPI out to all the other CPUs in cpu_online_map, > and waits for num_online_cpus()-1 CPUs to answer.
You cannot do that by counting without a lot of care. IPI messages do not have guaranteed "once only" semantics. On an error a resend can and has been observed to cause a reissue of an IPI on PII/PIII setups
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