[PATCH] fix heartbeat

[Paul Mackerras]

Val Henson writes:
>
> The heartbeat function will not execute properly on Gemini without
> this patch. (Check for cpu 0 removed from gemini_heartbeat.)

CHRP needs the heartbeat function called on all cpus, IIRC.

Clearly the heartbeat_count needs to be per-cpu or else pushed into
the heartbeat function.  How about we make it just

	if (ppc_md.heartbeat)
		ppc_md.heartbeat();

and let the heartbeat function do the if (!smp_processor_id()) and the
if (!heartbeat_count--) if it wants?

Paul.

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