Re: [patch 2/2] x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y

2019-03-26 Thread Greg KH
On Tue, Mar 26, 2019 at 05:36:06PM +0100, Thomas Gleixner wrote: > The SMT disable 'nosmt' command line argument is not working properly when > CONFIG_HOTPLUG_CPU is disabled. The teardown of the sibling CPUs which are > required to be brought up due to the MCE issues, cannot work. The CPUs are >

[patch 2/2] x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y

2019-03-26 Thread Thomas Gleixner
The SMT disable 'nosmt' command line argument is not working properly when CONFIG_HOTPLUG_CPU is disabled. The teardown of the sibling CPUs which are required to be brought up due to the MCE issues, cannot work. The CPUs are then kept in a half dead state. As the 'nosmt' functionality has become