cpu/hotplug: Boot HT siblings at least once
Due to the way Machine Check Exceptions work on X86 hyperthreads it's required to boot up _all_ logical cores at least once in order to set the CR4.MCE bit. So instead of ignoring the sibling threads right away, let them boot up once so they can configure themselves. After they came out of the initial boot stage check whether its a "secondary" sibling and cancel the operation which puts the CPU back into offline state. Reported-by: NDave Hansen <dave.hansen@intel.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Tested-by: NTony Luck <tony.luck@intel.com>
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