linux-kernel - [PATCH] x86: Restore missing cpumask_copy() in __x2apic_send_IPI

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Date:	Fri, 5 Sep 2014 13:34:31 -0600
From:	Ted Percival <ted@...p.id.au>
To:	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, Ted Percival <ted@...p.id.au>
Subject: [PATCH] x86: Restore missing cpumask_copy() in __x2apic_send_IPI_mask

This fixes a hang when initializing SMP CPUs at this point in the boot:

x86: Booting SMP configuration
.... node  #0, CPUs:      #1_

Fixes: 4ba2968420fa ("percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t")
Signed-off-by: Ted Percival <ted@...p.id.au>
---
 arch/x86/kernel/apic/x2apic_cluster.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 1f5d5f2ffae6..e658f21681c8 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -43,6 +43,7 @@ __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
 	 * and be sure it's manipulated with irq off.
 	 */
 	ipi_mask_ptr = this_cpu_cpumask_var_ptr(ipi_mask);
+	cpumask_copy(ipi_mask_ptr, mask);
 
 	/*
 	 * The idea is to send one IPI per cluster.
-- 
1.9.1

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