linux-kernel - Re: [PATCH 0/9] BSP or CPU0 online/offline

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Message-ID: <4EB51B5A.9020300@linux.vnet.ibm.com>
Date:	Sat, 05 Nov 2011 16:47:46 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Len Brown <len.brown@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 0/9] BSP or CPU0 online/offline

On 11/05/2011 03:33 AM, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> 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.
> 
> Fenghua Yu (9):
>   include/linux/cpu.h: Define architecture dependent cpu map update and
>     state check functions
>   kernel/cpu.c: Add arch dependent cpu map update functions
>   x86/i387.c: Thread xstate is initialized only on BSP once
>   x86/common.c: Init BSP data during BSP online
>   x86/mtrr/main.c: Ask the first online CPU to save mtrr
>   kernel/power/suspend.c,hibernate.c: Don't hibernate/suspend if CPU0
>     is offline
>   x86/topology.c: Support functions for BSP online/offline
>   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
> 

The norm usually followed is to update the version number of the patch
or patchset at each iteration and mention the significant changes between
the versions in the changelog/cover-letter (and possibly give links to older
versions). This would make reviewing patches much more easier.

>  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          |   44 +++++++++++++++++++++++++++++-----
>  include/linux/cpu.h                 |    6 ++++
>  kernel/cpu.c                        |   12 +++++++++
>  kernel/power/hibernate.c            |    5 ++++
>  kernel/power/main.c                 |    5 ++++
>  kernel/power/suspend.c              |    4 +++
>  13 files changed, 163 insertions(+), 20 deletions(-)
> 

Thanks,
Srivatsa S. Bhat

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