linux-kernel - [PATCH 2/4] mn10300/CPU hotplug: Add missing call to notify_cpu

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Message-ID: <20120322112830.17063.88766.stgit@srivatsabhat.in.ibm.com>
Date:	Thu, 22 Mar 2012 16:58:47 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	rkuo@...eaurora.org, tglx@...utronix.de, linas@...eaurora.org,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, dhowells@...hat.com,
	yasutake.koichi@...panasonic.com, akpm@...ux-foundation.org,
	benh@...nel.crashing.org, jesper.nilsson@...s.com,
	cmetcalf@...era.com, linux@....linux.org.uk, jejb@...isc-linux.org,
	deller@....de, vapier@...too.org
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-am33-list@...hat.com, linux-parisc@...r.kernel.org
Subject: [PATCH 2/4] mn10300/CPU hotplug: Add missing call to
 notify_cpu_starting()

The scheduler depends on receiving the CPU_STARTING notification, without
which we end up into a lot of trouble. So add the missing call to
notify_cpu_starting() in the bringup code.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 arch/mn10300/kernel/smp.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
index 9242e9f..25ca7fe 100644
--- a/arch/mn10300/kernel/smp.c
+++ b/arch/mn10300/kernel/smp.c
@@ -875,10 +875,14 @@ static void __init smp_online(void)
 
 	cpu = smp_processor_id();
 
-	local_irq_enable();
+	notify_cpu_starting(cpu);
 
+	ipi_call_lock();
 	set_cpu_online(cpu, true);
-	smp_wmb();
+	ipi_call_unlock();
+
+	local_irq_enable();
+
 }
 
 /**

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