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Subject[PATCH v4 0/7] x86: BSP or CPU0 online/offline
From: Fenghua Yu <>

BSP or CPU0 has been the last obstacle to CPU hotplug on x86. This patch set
implements BSP online and offline and removes this obstacle to CPU hotplug.

RAS needs the feature. If socket0 needs to be hotplugged for any reason (any
thread on socket0 is bad, shared cache issue, uncore issue, etc), CPU0 is
required to be offline or hot replaced to keep the system run.

v4: Add __read_mostly for bsp_hotpluggable variable. Add my email address in
cpu-hotplug.txt document. A wording change in comment.

v3: Register a pm notifier to check if CPU0 is online before hibernate/suspend.
Small wording changes in document and print info.

v2: Add locking changes between cpu hotplug and hibernate/suspend. Change PIC
irq bound to CPU0 detection.

Fenghua Yu (7):
x86/topology.c: Support functions for BSP online/offline
x86/common.c: Init BSP data during BSP online
x86/mtrr/main.c: Ask the first online CPU to save mtrr
x86/smpboot.c: Don't offline BSP if any irq can not be migrated out
of it
Documentations/cpu-hotplug.tx, kernel-parameters.txt: Add x86 CPU0
online/offline feature
x86/i387.c: Thread xstate is initialized only on BSP once
x86/power/cpu.c: Don't hibernate/suspend if CPU0 is offline

Documentation/cpu-hotplug.txt | 19 +++++++++++++++
Documentation/kernel-parameters.txt | 13 ++++++++++
arch/x86/include/asm/processor.h | 1 +
arch/x86/kernel/cpu/common.c | 13 ++++++++--
arch/x86/kernel/cpu/mtrr/main.c | 9 +++++-
arch/x86/kernel/i387.c | 9 ++++++-
arch/x86/kernel/smpboot.c | 43 ++++++++++++++++++++++++++++-----
arch/x86/kernel/topology.c | 24 +++++++++++++-----
arch/x86/power/cpu.c | 44 +++++++++++++++++++++++++++++++++++
9 files changed, 155 insertions(+), 20 deletions(-)

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