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

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Date:	Fri, 7 Mar 2014 11:51:58 +0530
From:	Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	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

Hello Ben,

On Fri, Mar 07, 2014 at 01:57:31PM +1100, Benjamin Herrenschmidt wrote:
> 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....

This patch depends on
"[PATCH v2 02/52] CPU hotplug: Provide lockless versions of callback registration functions" 
of the series (Can be found here: https://lkml.org/lkml/2014/2/14/59).
This particular patch defines 'cpu_notifier_register_begin',
'__register_cpu_notifier', and 'cpu_notifier_register_done' in the
cpu-hotplug core. Are you seeing the build breakage with this patch on
?

--
Thanks and Regards
gautham.

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