linux-kernel - Re: [PATCH v5 44/45] CPU hotplug, stop_machine: Decouple CPU hotplug from stop

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Message-ID: <20130209001554.GR2666@linux.vnet.ibm.com>
Date:	Fri, 8 Feb 2013 16:15:54 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, rusty@...tcorp.com.au, mingo@...nel.org,
	akpm@...ux-foundation.org, namhyung@...nel.org,
	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 44/45] CPU hotplug, stop_machine: Decouple CPU hotplug
 from stop_machine() in Kconfig

On Tue, Jan 22, 2013 at 01:15:22PM +0530, Srivatsa S. Bhat wrote:
> ... and also cleanup a comment that refers to CPU hotplug being dependent on
> stop_machine().
> 
> Cc: David Howells <dhowells@...hat.com>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

(Hey, I thought I owed myself an easy one!)

> ---
> 
>  include/linux/stop_machine.h |    2 +-
>  init/Kconfig                 |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
> index 3b5e910..ce2d3c4 100644
> --- a/include/linux/stop_machine.h
> +++ b/include/linux/stop_machine.h
> @@ -120,7 +120,7 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
>   * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
>   *
>   * Description: This is a special version of the above, which assumes cpus
> - * won't come or go while it's being called.  Used by hotplug cpu.
> + * won't come or go while it's being called.
>   */
>  int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index be8b7f5..048a0c5 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1711,7 +1711,7 @@ config INIT_ALL_POSSIBLE
>  config STOP_MACHINE
>  	bool
>  	default y
> -	depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
> +	depends on (SMP && MODULE_UNLOAD)
>  	help
>  	  Need stop_machine() primitive.
> 
> 

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