linux-kernel - [PATCH 1/6] xen: set cpu_callout

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Date:	Tue, 12 May 2009 16:27:39 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 1/6] xen: set cpu_callout_mask to make mtrr work

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

The mtrr code uses num_booting_cpus() to manage its corrdinated mtrr update,
which in turn depends on cpu_callout_mask.

[ Impact: bugfix; make /proc/mtrr writes work in Xen ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/smp.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 429834e..4706af7 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -297,6 +297,8 @@ static int __cpuinit xen_cpu_up(unsigned int cpu)
 	xen_setup_timer(cpu);
 	xen_init_lock_cpu(cpu);
 
+	cpumask_set_cpu(cpu, cpu_callout_mask);
+
 	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 
 	/* make sure interrupts start blocked */
-- 
1.6.0.6

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