linux-kernel - [PATCH 2/8] x86/mtrr/main.c: Ask the first online CPU to save mtrr

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Date:	Wed,  5 Oct 2011 09:39:13 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H Peter Anvin" <hpa@...or.com>,
	"Zwane Mwaikambo" <zwane@....linux.org.uk>,
	"Tony Luck" <tony.luck@...el.com>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Len Brown" <lenb@...nel.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 2/8] x86/mtrr/main.c: Ask the first online CPU to save mtrr

From: Fenghua Yu <fenghua.yu@...el.com>

Ask the first online CPU to save mtrr instead of asking BSP. BSP can be
offlined when mtrr_save_state() is called.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/kernel/cpu/mtrr/main.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 6b96110..e18a4d3 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -695,11 +695,13 @@ void mtrr_ap_init(void)
 }
 
 /**
- * Save current fixed-range MTRR state of the BSP
+ * Save current fixed-range MTRR state of the first cpu in cpu_online_mask.
  */
 void mtrr_save_state(void)
 {
-	smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1);
+	int first_cpu = cpumask_first(cpu_online_mask);
+
+	smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
 }
 
 void set_mtrr_aps_delayed_init(void)
-- 
1.6.0.3

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