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x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y
commit bebd024e48
upstream.
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 popular due to the speculative
hardware vulnerabilities, the half torn down state is not a proper solution
to the problem.
Enforce CONFIG_HOTPLUG_CPU=y when SMP is enabled so the full operation is
possible.
Reported-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Mukesh Ojha <mojha@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Rik van Riel <riel@surriel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Micheal Kelley <michael.h.kelley@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20190326163811.598166056@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 7 deletions
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@ -2139,14 +2139,8 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING
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If unsure, leave at the default value.
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If unsure, leave at the default value.
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config HOTPLUG_CPU
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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def_bool y
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depends on SMP
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depends on SMP
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---help---
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Say Y here to allow turning CPUs off and on. CPUs can be
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controlled through /sys/devices/system/cpu.
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( Note: power management support will enable this option
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automatically on SMP systems. )
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Say N if you want to disable CPU hotplug.
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config BOOTPARAM_HOTPLUG_CPU0
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config BOOTPARAM_HOTPLUG_CPU0
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bool "Set default setting of cpu0_hotpluggable"
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bool "Set default setting of cpu0_hotpluggable"
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