ARM: Don't send IPI in smp_send_stop if there's only one CPU

No need to send IPI if there's one CPU, especially when booting
systems with CONFIG_SMP_ON_UP that may not even support IPI.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 40dc74f..32e16da 100644 (file)
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -567,7 +567,8 @@ void smp_send_stop(void)
 {
        cpumask_t mask = cpu_online_map;
        cpu_clear(smp_processor_id(), mask);
-       send_ipi_message(&mask, IPI_CPU_STOP);
+       if (!cpus_empty(mask))
+               send_ipi_message(&mask, IPI_CPU_STOP);
 }
 
 /*