• Linus Torvalds's avatar
    Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · c29d8541
    Linus Torvalds authored
    Pull CPU hotplug fixes from Thomas Gleixner:
     "Two SMT/hotplug related fixes:
    
       - Prevent crash when HOTPLUG_CPU is disabled and the CPU bringup
         aborts. This is triggered with the 'nosmt' command line option, but
         can happen by any abort condition. As the real unplug code is not
         compiled in, prevent the fail by keeping the CPU in zombie state.
    
       - Enforce HOTPLUG_CPU for SMP on x86 to avoid the above situation
         completely. With 'nosmt' being a popular option it's required to
         unplug the half brought up sibling CPUs (due to the MCE wreckage)
         completely"
    
    * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
      x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y
      cpu/hotplug: Prevent crash when CPU bringup fails on CONFIG_HOTPLUG_CPU=n
    c29d8541
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