[Xen-devel] [for-4.7 v2 3/5] xen/arm: acpi: Fix SMP support when booting with ACPI

[Julien Grall <julien.grall@xxxxxxx>]

The variable enabled_cpus is used to know the number of CPU enabled in
the MADT.

Currently this variable is used to check the validity of the boot CPU.
It will be considered invalid when "enabled_cpus > 1".

However, this condition also means that multiple CPUs are present on the
system. So secondary will never be brought up.

The correct way to check the validity of the boot CPU is to use the
variable bootcpu_valid.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Reviewed-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

---
    Changes in v2:
        - Add Stefano's and Shannon's reviewed-by
---
 xen/arch/arm/acpi/boot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
index 1bba1cf..a952efd 100644
--- a/xen/arch/arm/acpi/boot.c
+++ b/xen/arch/arm/acpi/boot.c
@@ -149,7 +149,7 @@ void __init acpi_smp_init_cpus(void)
         return;
     }
 
-    if ( enabled_cpus > 1 )
+    if ( !bootcpu_valid )
     {
         printk("MADT missing boot CPU MPIDR, not enabling secondaries\n");
         return;
-- 
1.9.1


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