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>

2 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4b01d71bdbd1..abba5b8c9d74 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2001,7 +2001,7 @@ config XIP_PHYS_ADDR
 
 config KEXEC
         bool "Kexec system call (EXPERIMENTAL)"
-        depends on EXPERIMENTAL
+        depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
         help
           kexec is a system call that implements the ability to shutdown your
           current kernel, and to start another kernel.  It is like a reboot
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 76ff28d87bf3..57db122a4f62 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -522,6 +522,10 @@ static void ipi_cpu_stop(unsigned int cpu)
         local_fiq_disable();
         local_irq_disable();
 
+#ifdef CONFIG_HOTPLUG_CPU
+        platform_cpu_kill(cpu);
+#endif
+
         while (1)
                 cpu_relax();
 }