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-rw-r--r--arch/arm64/kernel/smp.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 4ced34f62dab..31c8b3094dd7 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -264,6 +264,13 @@ asmlinkage notrace void secondary_start_kernel(void)
set_cpu_online(cpu, true);
complete(&cpu_running);
+ /*
+ * Secondary CPUs enter the kernel with all DAIF exceptions masked.
+ *
+ * As with setup_arch() we must unmask Debug and SError exceptions, and
+ * as the root irqchip has already been detected and initialized we can
+ * unmask IRQ and FIQ at the same time.
+ */
local_daif_restore(DAIF_PROCCTX);
/*