[PATCHv2] omap2+: pm: cpufreq: Fix loops_per_jiffy calculation

Colin Cross ccross at google.com
Tue Jun 28 18:58:57 EDT 2011


On Tue, Jun 28, 2011 at 3:55 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Tue, Jun 28, 2011 at 03:29:57PM -0700, Colin Cross wrote:
>> Can't this rewrite the loops_per_jiffy for the other CPU while it is
>> in a udelay?  If it has already calculated the number of loops
>> necessary, and the CPU frequency increases, it could end up returning
>> too early from udelay.
>
> udelay uses the global loops_per_jiffy.
>

The problem is still the same - loops_per_jiffy applies to both CPUs,
and the frequency of the other CPU cannot be changed if it is in a
udelay.



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