On Tue, May 02, 2006 at 09:59:18AM -0700, Mary Edie Meredith wrote: > On Tue, 2006-05-02 at 07:50 -0700, Raj, Ashok wrote: > > Yes, cpu0 was not offlineable since inception. (both in x86 and x86_64) > > due to certain other dependencies that would need more cleanup in kernel > > code. > > > > Even though you had an online file earlier, its was a no-op.. basically > > when you echo 1 to offline to cpu0, we just returned error and did > > nothing. > > So that means that an implementation _can have an online file, even > though the corresponding cpu is not able to offline. Sounds like having > an online file in sysfs isn't a sure indication of an "off-lineable" cpu > after all. Well, possibly, unless that situation is considered a bug. Mary, have you seen any sort of specification for the cpu hotplug design that indicates when the online file should/shouldn't be present, or anything regarding for a given architecture, how to determine what cpu's can be onlined/offlined? Bryce
