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SubjectRe: [PATCH] SMP signal latency fix up.

> the 'is it running' check is 'task_curr(p)', which in this circumstance is
> equivalent to the following test:
> per_cpu(runqueues, (cpu)).curr == p

btw., the 'is it running right now' test is a necessary thing as well - we
really dont want to flood CPUs with IPIs which just happen to have the
target task in their runqueue (but the task is not executing).

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