Re: [PATCH] x86: enable preemption in delay

[Arjan van de Ven]

On Sat, 24 May 2008 23:11:20 -0400 (EDT)
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> 
> In git commit 35d5d08a085c56f153458c3f5d8ce24123617faf, Andrew Morton
> placed preempt_disable around the entire delay due to TSC's not
> working nicely on SMP.  Unfortunately for those that care about
> latencies this is devastating! Especially when we have callers to
> mdelay(8).

we used to have a WARN_ON if mdelay was called while preemptable..
maybe we should put that back in?
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