From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> When initialize swiotlb bounce buffer, smp_init() has not been called and cpu number can not be got from num_online_cpus(). Use the number of lapic entry to set swiotlb area number and keep swiotlb area number equal to cpu number on the x86 platform. Based-on-idea-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> --- arch/x86/kernel/acpi/boot.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 907cc98b1938..7e13499f2c10 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -22,6 +22,7 @@ #include <linux/efi-bgrt.h> #include <linux/serial_core.h> #include <linux/pgtable.h> +#include <linux/swiotlb.h> #include <asm/e820/api.h> #include <asm/irqdomain.h> @@ -1131,6 +1132,8 @@ static int __init acpi_parse_madt_lapic_entries(void) return count; } + swiotlb_adjust_nareas(max(count, x2count)); + x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI, acpi_parse_x2apic_nmi, 0); count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, -- 2.25.1
