linux-kernel - [PATCH] x86, apic: Fix unmasked CPU initialization

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Date:	Mon, 8 Sep 2014 10:15:37 -0600
From:	Ted Percival <ted@...p.id.au>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Christoph Lameter <cl@...ux.com>,
	Ted Percival <ted@...p.id.au>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>
CC:	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, apic: Fix unmasked CPU initialization

Commit 4ba2968420fa removed the application of the CPU mask resulting
in a hang when initializing the first CPU at 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 1f5d5f2..e658f21 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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