Comment 0 for bug 248509

In the mainline kernel there are some deadlock issues when hot removing a
processor. This issues were discussed in detail at:

https://bugzilla.redhat.com/show_bug.cgi?id=448588

These 7 commits fix CPU hotplug:

ba62b077871a5255e271f4fdae57167651839277 - acpi: fix "buggy BIOS check" when CPUs are hot removed
63d38198a0f57dca87e6cb79931c7bedbb7ab069 - x86: fix paranoia about using BIOS quickboot mechanism.
2f67a0695dc389247c05041b05d2a2b06fc102a3 - flush kacpi_notify_wq before removing notify handler
087803d18fb8259cb844c075a35fb27c2d80792e - fix a deadlock issue when poking "eject" file
3d5ed99657e93cd0453a187c478e663e6b6a3a8b - force offline the processor during hot-removal
89d675d0f987534139d330eb2689ec53fab9404e - create sysfs link from acpi device to sysdev for cpu
ad7f0d9feee6980a3ab3ea806854f56817d1da8e - ACPI: fix checkpatch.pl complaints in scan.c