Improve output when using sysrq-l command (show backtrace for all cpus).
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/include/asm/irq.h b/arch/parisc/include/asm/irq.h
index 1073599..99989ad 100644
--- a/arch/parisc/include/asm/irq.h
+++ b/arch/parisc/include/asm/irq.h
@@ -49,4 +49,9 @@ extern int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest);
/* soft power switch support (power.c) */
extern struct tasklet_struct power_tasklet;
+#ifdef CONFIG_SMP
+void arch_trigger_all_cpu_backtrace(void);
+#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
+#endif
+
#endif /* _ASM_PARISC_IRQ_H */
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 2e6443b..2e66892 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -615,3 +615,44 @@ void __init init_IRQ(void)
#endif
set_eiem(cpu_eiem); /* EIEM : enable all external intr */
}
+
+
+
+/*
+ * Backtrace of all CPUs via IPI. Used when sending sysrq-l.
+ */
+
+#ifdef arch_trigger_all_cpu_backtrace
+static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
+
+static void smp_call_func_backtrace(void *info)
+{
+ int cpu;
+ cpu = smp_processor_id();
+
+ if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
+ static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
+
+ arch_spin_lock(&lock);
+ pr_warn("IPI backtrace for cpu %d\n", cpu);
+ /* show_regs(get_irq_regs()); */
+ show_stack(NULL, 0);
+ arch_spin_unlock(&lock);
+ cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
+ }
+}
+
+void arch_trigger_all_cpu_backtrace(void)
+{
+ unsigned long flags;
+
+ cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
+
+ pr_info("sending IPI to all CPUs:\n");
+ local_irq_save(flags);
+ local_irq_enable();
+ on_each_cpu(smp_call_func_backtrace, NULL, 0);
+ local_irq_restore(flags);
+}
+#endif
+
--
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