On Wed, 2009-10-07 at 16:56 +0530, Vaidyanathan Srinivasan wrote: > * Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> [2009-10-06 20:04:39]: > > > On Tue, 2009-10-06 at 22:05 +0530, Arun R Bharadwaj wrote: > > > > > Also, the per-cpu nature of registration/unregistration of cpuidle > > > has been maintained as ACPI needs this. > > > > Right, so can't we ditch that and have acpi default to the lowest > common > > C-state and warn when various cpus report different C-states? > > Hi Peter, > > As Arjan mentioned previously, the per-cpu registration has to stay > for x86 for now due to legacy ACPI compatibility. Breaking that may > break lot of existing users and we do not have a clean fallback > method. >From what I understood some broken ass bioses report different C state availability on different CPUs in the same SMP system. I'm suggesting to work around that by limiting all CPUs to the subset of C states reported on all CPUs, instead of the current mess. I haven't heard anybody tell me why that wouldn't be possible on x86 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
