linux-kernel - [ 34/36] xen/arm: missing put_cpu in xen_percpu

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Date:	Thu,  5 Sep 2013 13:28:03 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Julien Grall <julien.grall@...aro.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [ 34/36] xen/arm: missing put_cpu in xen_percpu_init

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julien Grall <julien.grall@...aro.org>

commit 0d7febe58413884f6428143221971618fbf3a47d upstream.

When CONFIG_PREEMPT is enabled, Linux will not be able to boot and warn:
[    4.127825] ------------[ cut here ]------------
[    4.133376] WARNING: at init/main.c:699 do_one_initcall+0x150/0x158()
[    4.140738] initcall xen_init_events+0x0/0x10c returned with preemption imbalance

This is because xen_percpu_init uses get_cpu but doesn't have the corresponding
put_cpu.

Signed-off-by: Julien Grall <julien.grall@...aro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/xen/enlighten.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -170,6 +170,7 @@ static void __init xen_percpu_init(void
 	per_cpu(xen_vcpu, cpu) = vcpup;
 
 	enable_percpu_irq(xen_events_irq, 0);
+	put_cpu();
 }
 
 static void xen_restart(char str, const char *cmd)


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