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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 <rusty@rustcorp.com.au>
    >
    > 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?

    YH


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