From: "Fenghua Yu" <fenghua.yu@intel.com>
To: "Ingo Molnar" <mingo@elte.hu>,
"Thomas Gleixner" <tglx@linutronix.de>,
"H Peter Anvin" <hpa@zytor.com>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Asit K Mallick" <asit.k.mallick@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Arjan Dan De Ven" <arjan@linux.intel.com>,
"Suresh B Siddha" <suresh.b.siddha@intel.com>,
"Len Brown" <len.brown@intel.com>,
"Srivatssa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
"Randy Dunlap" <rdunlap@xenotime.net>,
"Chen Gong" <gong.chen@linux.intel.com>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"linux-pm" <linux-pm@vger.kernel.org>, "x86" <x86@kernel.org>
Cc: "Fenghua Yu" <fenghua.yu@intel.com>
Subject: [PATCH v8 10/12] x86, hotplug: The first online processor saves the MTRR state
Date: Sat, 25 Aug 2012 10:41:26 -0700 [thread overview]
Message-ID: <1345916488-8355-11-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1345916488-8355-1-git-send-email-fenghua.yu@intel.com>
From: Fenghua Yu <fenghua.yu@intel.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@intel.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
next prev parent reply other threads:[~2012-08-25 17:57 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-25 17:41 [PATCH v8 0/12] x86: Arbitrary CPU hot(un)plug support Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 01/12] doc: Add x86 CPU0 online/offline feature Fenghua Yu
2012-08-27 17:07 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 02/12] x86, Kconfig: Add config switch for CPU0 hotplug Fenghua Yu
2012-08-27 17:08 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 03/12] x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it Fenghua Yu
2012-08-27 17:09 ` [tip:x86/bsp-hotplug] x86, topology: Don' t " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 04/12] x86, hotplug: Support functions for CPU0 online/offline Fenghua Yu
2012-08-27 17:10 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 05/12] x86, hotplug, suspend: Online CPU0 for suspend or hibernate Fenghua Yu
2012-08-27 17:10 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 06/12] x86-64, hotplug: Add start_cpu0() entry point to head_64.S Fenghua Yu
2012-08-27 17:11 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 07/12] x86-32, hotplug: Add start_cpu0() entry point to head_32.S Fenghua Yu
2012-08-27 17:12 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 08/12] x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI Fenghua Yu
2012-08-27 17:13 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 09/12] x86, hotplug: During CPU0 online, enable x2apic, set_numa_node Fenghua Yu
2012-08-27 17:14 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` Fenghua Yu [this message]
2012-08-27 17:15 ` [tip:x86/bsp-hotplug] x86, hotplug: The first online processor saves the MTRR state tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 11/12] x86/i387.c: Initialize thread xstate only on CPU0 only once Fenghua Yu
2012-08-27 17:16 ` [tip:x86/bsp-hotplug] " tip-bot for Fenghua Yu
2012-08-25 17:41 ` [PATCH v8 12/12] x86, topology: Debug CPU00 hotplug Fenghua Yu
2012-08-27 17:17 ` [tip:x86/bsp-hotplug] x86, topology: Debug CPU0 hotplug tip-bot for Fenghua Yu
2012-09-10 5:50 ` [PATCH v8 0/12] x86: Arbitrary CPU hot(un)plug support Ingo Molnar
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