Hi, On Wed, 2005-08-31 at 20:13 +0800, Natalie.Protasevich@xxxxxxxxxx wrote: > Current IA32 CPU hotplug code doesn't allow bringing up processors > that were not present in the boot configuration. > To make existing hot plug facility more practical for physical hot > plug, possible processors should be encountered > during boot for potentual hot add/replace/remove. On ES7000, ACPI > marks all the sockets that are empty or not assigned > to the partitionas as "disabled". The patch allows arrays/masks with > APIC info for disabled processors to be > initialized. Then the OS can bring up a processor that was inserted in > the socked and brought into configuration > during runtime. > To test the code, one can boot the system with maxcpu=1 and then bring > the rest of the processors up, which was not > possible so far (only maxcpus number of nodes were created). > The patch also makes proc entry for interrupts dynamically change to > only show current onlined processors. Could we clean up the cpu_present_map a bit, like IA64 does? Eg, if a new CPU is inserted, we allocated cpu id for it and set cpu_present_map. Current alloc_cpu_id is just a workaround for suspend/resume use, but isn't ok for physical cpu hotplug to me. Thanks, Shaohua
