linux-kernel - [PATCH V7 2/4] cpu-hotplug: export cpu_hotplug_enable/cpu_hotplug

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Message-Id: <1437670348-30307-2-git-send-email-kys@microsoft.com>
Date:	Thu, 23 Jul 2015 09:52:26 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com, jasowang@...hat.com, tglx@...utronix.de
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V7 2/4] cpu-hotplug: export cpu_hotplug_enable/cpu_hotplug_disable

From: Vitaly Kuznetsov <vkuznets@...hat.com>

Hyper-V module needs to disable cpu hotplug (offlining) as there is no
support from hypervisor side to reassign already opened event channels
to a different CPU. Currently it is been done by altering
smp_ops.cpu_disable but it is hackish.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 kernel/cpu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 1225fc2..18f00ae 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -194,6 +194,7 @@ void cpu_hotplug_disable(void)
 	cpu_hotplug_disabled++;
 	cpu_maps_update_done();
 }
+EXPORT_SYMBOL_GPL(cpu_hotplug_disable);
 
 void cpu_hotplug_enable(void)
 {
@@ -201,7 +202,7 @@ void cpu_hotplug_enable(void)
 	WARN_ON(--cpu_hotplug_disabled < 0);
 	cpu_maps_update_done();
 }
-
+EXPORT_SYMBOL_GPL(cpu_hotplug_enable);
 #endif	/* CONFIG_HOTPLUG_CPU */
 
 /* Need to know about CPUs going up/down? */
-- 
1.7.4.1

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