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SubjectRe: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =
Rusty Russell wrote:
> On Sun, 7 Jun 2009 07:23:52 am Yinghai Lu wrote:
>> so later could use nr_cpumask_bits in cpumask_size when MAXSMP is used
> I have a (more ambitious) patch for this in my queue, which weans it off this
> entirely:
> Subject: cpumask: avoid playing with cpus_allowed in powernow-k8.c
> From: Rusty Russell <>
> It's generally a very bad idea to mug some process's cpumask: it could
> legitimately and reasonably be changed by root, which could break us
> (if done before our code) or them (if we restore the wrong value).
> I use work_on_cpu, which is slightly less efficient than the old code,
> but the code is complex enough that using smp_call_function_single()
> is not trivial.

will be in .31?


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