linux-kernel - Re: [PATCH v4 4/5] sched: add a new SD_SHARE_POWERDOMAIN for sched

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Date:	Fri, 18 Apr 2014 12:58:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	tony.luck@...el.com, fenghua.yu@...el.com, schwidefsky@...ibm.com,
	cmetcalf@...era.com, benh@...nel.crashing.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	dietmar.eggemann@....com, preeti@...ux.vnet.ibm.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v4 4/5] sched: add a new SD_SHARE_POWERDOMAIN for
 sched_domain

On Fri, Apr 11, 2014 at 11:44:40AM +0200, Vincent Guittot wrote:
> A new flag SD_SHARE_POWERDOMAIN is created to reflect whether groups of CPUs
> in a sched_domain level can or not reach different power state. As an example,
> the flag should be cleared at CPU level if groups of cores can be power gated
> independently. This information can be used in the load balance decision or to
> add load balancing level between group of CPUs that can power gate
> independantly.
> This flag is part of the topology flags that can be set by arch.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> ---

Building a cris-defconfig this gets me an endless stream of misery:

In file included from /usr/src/linux-2.6/init/do_mounts.c:12:0:
/usr/src/linux-2.6/include/linux/sched.h:1048:46: warning: 'struct sched_domain_topology_level' declared inside parameter list [enabled by default]
/usr/src/linux-2.6/include/linux/sched.h:1048:46: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
In file included from /usr/src/linux-2.6/include/linux/utsname.h:5:0,
                 from /usr/src/linux-2.6/include/linux/init_task.h:6,
                 from /usr/src/linux-2.6/init/init_task.c:1:

Might be something about UP builds, didn't check x86-UP.
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