linux-kernel - Re: [PATCH v2 14/52] powerpc, sysfs: Fix CPU hotplug callback registration

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Date:	Fri, 07 Mar 2014 13:57:31 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	paulus@...ba.org, oleg@...hat.com, mingo@...nel.org,
	rusty@...tcorp.com.au, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tj@...nel.org, walken@...gle.com, ego@...ux.vnet.ibm.com,
	linux@....linux.org.uk, rjw@...ysocki.net,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Olof Johansson <olof@...om.net>,
	Wang Dongsheng <dongsheng.wang@...escale.com>,
	linuxppc-dev@...ts.ozlabs.org,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 14/52] powerpc, sysfs: Fix CPU hotplug callback
 registration

On Fri, 2014-02-14 at 13:22 +0530, Srivatsa S. Bhat wrote:
> Subsystems that want to register CPU hotplug callbacks, as well as perform
> initialization for the CPUs that are already online, often do it as shown
> below:
> 
> 	get_online_cpus();
> 
> 	for_each_online_cpu(cpu)
> 		init_cpu(cpu);
> 
> 	register_cpu_notifier(&foobar_cpu_notifier);
> 
> 	put_online_cpus();

This patch breaks a good half of my test configs with:

/home/benh/linux-powerpc-test/arch/powerpc/kernel/sysfs.c: In function 'topology_init':
/home/benh/linux-powerpc-test/arch/powerpc/kernel/sysfs.c:979:2: error: implicit declaration of function 'cpu_notifier_register_begin' [-Werror=implicit-function-declaration]
/home/benh/linux-powerpc-test/arch/powerpc/kernel/sysfs.c:1004:2: error: implicit declaration of function '__register_cpu_notifier' [-Werror=implicit-function-declaration]
/home/benh/linux-powerpc-test/arch/powerpc/kernel/sysfs.c:1006:2: error: implicit declaration of function 'cpu_notifier_register_done' [-Werror=implicit-function-declaration]
cc1: all warnings being treated as errors
make[2]: *** [arch/powerpc/kernel/sysfs.o] Error 1
make[2]: *** Waiting for unfinished jobs....

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