Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5 | Date | Tue, 14 Feb 2012 19:55:36 +1030 |
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On Mon, 13 Feb 2012 13:57:45 -0800, Tony Luck <tony.luck@gmail.com> wrote: > On Mon, Feb 13, 2012 at 12:44 PM, Srivatsa S. Bhat > <srivatsa.bhat@linux.vnet.ibm.com> wrote: > > IOW, what output do you see from the following printk from > > arch/ia64/kernel/smpboot.c? > > > > printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", > > (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); > > That is a complicated question - because linux-next also has patches > by Arjan that > change how (when) cpus are brought online. Initially I blamed his > patches and tried > reverting them ... and saw the symptom you are wondering about (message said > "Total of 1 processors", but the BogoMIPs was a number big enough to be all of > them. Thanks to you, I can now understand why. > > Fix will be to stop ia64 from messing directly with cpu_online_map?
Yes, and the other architectures.
We're well within reach of removing cpu_*_map now I think.
Cheers, Rusty.
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