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    SubjectRe: [PATCH 1/2] scalable rw_mutex
    On 05/12, Andi Kleen wrote:
    >
    > --- linux-2.6.21-git2-net.orig/kernel/cpu.c
    > +++ linux-2.6.21-git2-net/kernel/cpu.c
    > @@ -26,6 +26,10 @@ static __cpuinitdata RAW_NOTIFIER_HEAD(c
    > */
    > static int cpu_hotplug_disabled;
    >
    > +/* Contains any CPUs that were ever online at some point.
    > + No guarantee they were fully initialized though */
    > +cpumask_t cpu_everonline_map;
    > +
    > #ifdef CONFIG_HOTPLUG_CPU
    >
    > /* Crappy recursive lock-takers in cpufreq! Complain loudly about idiots */
    > @@ -212,6 +216,8 @@ static int __cpuinit _cpu_up(unsigned in
    > if (cpu_online(cpu) || !cpu_present(cpu))
    > return -EINVAL;
    >
    > + cpu_set(cpu, cpu_everonline_map);
    > +

    This also allows us to de-uglify workqueue.c a little bit, it uses
    a home-grown cpu_populated_map.

    Oleg.

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