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SubjectRe: [PATCH] percpu data: only iterate over possible CPUs
Rik van Riel a écrit :
> On Sun, 5 Feb 2006, Linux Kernel Mailing List wrote:
>
>> [PATCH] percpu data: only iterate over possible CPUs
>
> This sched.c bit breaks Xen, and probably also other architectures
> that have CPU hotplug. I suspect the reason is that during early
> bootup only the boot CPU is online, so nothing initialises the
> runqueues for CPUs that are brought up afterwards.
>
> I suspect we can get rid of this problem quite easily by moving
> runqueue initialisation to init_idle()...

Please fix Xen to match include/linux/cpumask.h documentation that says :

/*
* The following particular system cpumasks and operations manage
* possible, present and online cpus. Each of them is a fixed size
* bitmap of size NR_CPUS.
*
* #ifdef CONFIG_HOTPLUG_CPU
* cpu_possible_map - all NR_CPUS bits set
* cpu_present_map - has bit 'cpu' set iff cpu is populated
* cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
* #else
* cpu_possible_map - has bit 'cpu' set iff cpu is populated
* cpu_present_map - copy of cpu_possible_map
* cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
* #endif
*/



Eric
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