ARM: smp: implement arch_trigger_all_cpus_backtrace using IPI
Based on a rough patch by frank.rowand@am.sony.com
Since ARM doesn't have an NMI (fiq's are not always available),
send an IPI to all other CPUs (current cpu prints the stack directly)
to capture a backtrace.
Change-Id: I8b163c8cec05d521b433ae133795865e8a33d4e2
Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 0e977fc..3c5eb26 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -61,6 +61,18 @@
static volatile int hlt_counter;
+#ifdef CONFIG_SMP
+void arch_trigger_all_cpu_backtrace(void)
+{
+ smp_send_all_cpu_backtrace();
+}
+#else
+void arch_trigger_all_cpu_backtrace(void)
+{
+ dump_stack();
+}
+#endif
+
void disable_hlt(void)
{
hlt_counter++;