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Message-Id: <1350058189-6769-11-git-send-email-fenghua.yu@intel.com>
Date: Fri, 12 Oct 2012 09:09:47 -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>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Asit K Mallick" <asit.k.mallick@...el.com>,
"Tony Luck" <tony.luck@...el.com>,
"Arjan Dan De Ven" <arjan@...ux.intel.com>,
"Suresh B Siddha" <suresh.b.siddha@...el.com>,
"Len Brown" <len.brown@...el.com>,
"Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
"Randy Dunlap" <rdunlap@...otime.net>,
"Chen Gong" <gong.chen@...ux.intel.com>,
"linux-kernel" <linux-kernel@...r.kernel.org>,
"linux-pm" <linux-pm@...r.kernel.org>, "x86" <x86@...nel.org>
Cc: "Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH v9 10/12] x86, hotplug: The first online processor saves the MTRR state
From: Fenghua Yu <fenghua.yu@...el.com>
Ask the first online CPU to save mtrr instead of asking BSP. BSP could be
offline when mtrr_save_state() is called.
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
arch/x86/kernel/cpu/mtrr/main.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 6b96110..e4c1a41 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -695,11 +695,16 @@ 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;
+
+ get_online_cpus();
+ first_cpu = cpumask_first(cpu_online_mask);
+ smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
+ put_online_cpus();
}
void set_mtrr_aps_delayed_init(void)
--
1.7.2
--
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