Commit 22b7c752 authored Jan 19, 2017 by Kyle Yan Committed by Prasad Sodagudi Jul 06, 2017

arm64: Dump stack for all CPUs on SMP CPU stop



Add the stack dump and printk of other CPUs when they are stopped
during an abnormal operation like a panic - This information is useful
for debugging to get a clear idea of what might have caused a crash.

Change-Id: I91a62cfc7cdb49b9cdbb247869b5ba799947ece5
Signed-off-by: Kyle Yan <kyan@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>

parent 311b795a

arch/arm64/kernel/smp.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -830,11 +830,20 @@ void arch_irq_work_raise(void)
		}
		#endif

		static DEFINE_RAW_SPINLOCK(stop_lock);
		/*
		* ipi_cpu_stop - handle IPI from smp_send_stop()
		*/
		static void ipi_cpu_stop(unsigned int cpu)
		{
		if (system_state == SYSTEM_BOOTING \|\|
		system_state == SYSTEM_RUNNING) {
		raw_spin_lock(&stop_lock);
		pr_crit("CPU%u: stopping\n", cpu);
		dump_stack();
		raw_spin_unlock(&stop_lock);
		}

		set_cpu_active(cpu, false);

		local_irq_disable();