Re: [RFC][PATCH 1/5] x86: Remove const_udelay() caring about whichcpu var it uses

[Christoph Lameter]

On Mon, 19 Sep 2011, Steven Rostedt wrote:

> The __const_udelay() code originally used raw_smp_processor_id()
> in its calculations for a delaying. Probably because if it were
> to migrate, it would take much longer to do so than the requested
> delay.
>
> Switch from this_cpu_read() to __this_cpu_read() to document that
> the read is racy and we do not care.

Is preemption disabled by all callers to __const_udelay?
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