[PATCH 2/2] x86/ACPI: Set swiotlb area according to the number of lapic entry in MADT

[Tianyu Lan <ltykernel@gmail.com>]

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

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@linux.intel.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 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