linux-kernel - [PATCH 3/3] CPU hotplug, arch/sparc: Fix CPU hotplug callback registration

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Date:	Thu, 01 Mar 2012 13:48:30 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	sparclinux@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Nick Piggin <npiggin@...nel.dk>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"David S. Miller" <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 3/3] CPU hotplug, arch/sparc: Fix CPU hotplug callback registration


Restructure CPU hotplug setup and callback registration in topology_init
so as to be race-free.

---

 arch/sparc/kernel/sysfs.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/sparc/kernel/sysfs.c b/arch/sparc/kernel/sysfs.c
index 654e8aa..22cb881 100644
--- a/arch/sparc/kernel/sysfs.c
+++ b/arch/sparc/kernel/sysfs.c
@@ -300,16 +300,14 @@ static int __init topology_init(void)
 
 	check_mmu_stats();
 
-	register_cpu_notifier(&sysfs_cpu_nb);
-
 	for_each_possible_cpu(cpu) {
 		struct cpu *c = &per_cpu(cpu_devices, cpu);
 
 		register_cpu(c, cpu);
-		if (cpu_online(cpu))
-			register_cpu_online(cpu);
 	}
 
+	register_allcpu_notifier(&sysfs_cpu_nb, true, NULL);
+
 	return 0;
 }
 


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