[2.6.30 BUG] CPU hotplug and alternatives problem when going 2 ->1 CPU

[Mathieu Desnoyers]

Hi,

I ran into a "stucked process" when trying to bring down all my CPUs on
a 2.6.30 kernel (+ lttng patchset). It's Intel Core2 Xeon.

My printk output showed :

[  133.866683] CPU 1 is now offline                                   
[  134.958702] CPU 2 is now offline                                             
[  136.054832] CPU 3 is now offline                                             
[  137.148867] CPU 4 is now offline                                             
[  138.252997] CPU 5 is now offline                                             
[  139.455014] CPU 6 is now offline                                             
[  140.561271] CPU 7 is now offline                                             
[  140.570979] SMP alternatives: switching to UP code                           

Booting with noreplace-smp makes everything work fine. Maybe it's a new
bug in 2.6.30 ?

Mathieu


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Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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