ARM: stop: execute platform callback from cpu_stop code
Sending IPI_CPU_STOP to a CPU causes it to execute a busy cpu_relax
loop forever. This makes it impossible to kexec successfully on an SMP
system since the secondary CPUs do not reset.
This patch adds a callback to platform_cpu_kill, defined when
CONFIG_HOTPLUG_CPU=y, from the ipi_cpu_stop handling code. This function
currently just returns 1 on all platforms that define it but allows them
to do something more sophisticated in the future.
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 76ff28d..57db122 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -522,6 +522,10 @@
local_fiq_disable();
local_irq_disable();
+#ifdef CONFIG_HOTPLUG_CPU
+ platform_cpu_kill(cpu);
+#endif
+
while (1)
cpu_relax();
}