From: Fenghua Yu Date: Tue, 13 Nov 2012 19:32:48 +0000 (-0800) Subject: x86, hotplug: The first online processor saves the MTRR state X-Git-Tag: upstream/snapshot3+hdmi~6122^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=30242aa6023b71325c6b8addac06faf544a85fd0;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Link: http://lkml.kernel.org/r/1352835171-3958-12-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin --- 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)