[PATCH 0/2 v2] x86: Improve secondary CPU bring-up process robustness

[Igor Mammedov]

Reproduced mostly in virt. environments, where physical CPUs are shared
beetween many guests and on overcommited host guest's CPUs may stall
and lead to master CPU 'canceling' CPU bring-up. But in reality being
onlined CPU continued to boot and caused hangs when onlining another CPU.

Now, I'm trying do fix issue a bit earlier. I hope it's better than
the first attempt: https://lkml.org/lkml/2012/5/9/125
Please review.

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