linux-kernel - Re: [PATCH -v8 01/11] CPU hotplug: Provide a generic helper to disable/enable CPU hotplug

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Date:	Fri, 10 May 2013 23:16:10 -0500
From:	Robin Holt <holt@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Robin Holt <holt@....com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, Russ Anderson <rja@....com>,
	Russell King <linux@....linux.org.uk>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH -v8 01/11] CPU hotplug: Provide a generic helper to
 disable/enable CPU hotplug

On Fri, May 10, 2013 at 10:03:24AM -0700, Andrew Morton wrote:
> On Fri, 10 May 2013 13:11:51 +0200 "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > ...
> >
> > > cpu_hotplug_disable() doesn't get compiled unless we've defined
> > > CONFIG_PM_SLEEP_SMP.  I cannot begin to imagine what the logic is
> > > behind that!
> > 
> > I suppose it was only used by suspend/hibernate code paths when this was
> > introduced.
> 
> OK, well I suspect that what I have now is simply wrong for Robin's
> application.  Robin, can you please check this?  We probably want to
> make the does-something version of cpu_hotplug_disable/enable available
> if CONFIG_HOTPLUG_CPU.

This patch came from "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
I think I need to defer.

I spent all day trying to get an alpha cross compiler to build an
unmodified kernel and modules, only to find I didn't need to go that
far and could reproduce the failure with just building vmlinux.

Sorry for my slow response,
Robin
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