Messages in this thread Patch in this message | | | Date | Mon, 27 Aug 2012 10:15:34 -0700 | From | tip-bot for Fenghua Yu <> | Subject | [tip:x86/bsp-hotplug] x86, hotplug: The first online processor saves the MTRR state |
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Commit-ID: 8e5e52c7922c212067326850b794618f3e26aa63 Gitweb: http://git.kernel.org/tip/8e5e52c7922c212067326850b794618f3e26aa63 Author: Fenghua Yu <fenghua.yu@intel.com> AuthorDate: Sat, 25 Aug 2012 10:41:26 -0700 Committer: H. Peter Anvin <hpa@linux.intel.com> CommitDate: Sat, 25 Aug 2012 19:26:35 -0700
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@intel.com> Link: http://lkml.kernel.org/r/1345916488-8355-11-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.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)
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