Commit-ID: e7c6d2368362461d1c9e5d58bedbed9c3862b607
Gitweb: http://git.kernel.org/tip/e7c6d2368362461d1c9e5d58bedbed9c3862b607
Author: Fenghua Yu <fenghua.yu@xxxxxxxxx>
AuthorDate: Tue, 13 Nov 2012 11:32:48 -0800
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Wed, 14 Nov 2012 09:39:55 -0800
x86, hotplug: The first online processor saves the MTRR state
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@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1352835171-3958-12-git-send-email-fenghua.yu@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/mtrr/main.c | 9 +++++++--
1 file 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)
--
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