diff options
Diffstat (limited to 'lib/nmi_backtrace.c')
| -rw-r--r-- | lib/nmi_backtrace.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c index 15ca78e1c7d4..d01aec6ae15c 100644 --- a/lib/nmi_backtrace.c +++ b/lib/nmi_backtrace.c @@ -79,18 +79,28 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, * Force flush any remote buffers that might be stuck in IRQ context * and therefore could not run their irq_work. */ - printk_safe_flush(); + printk_trigger_flush(); clear_bit_unlock(0, &backtrace_flag); put_cpu(); } +// Dump stacks even for idle CPUs. +static bool backtrace_idle; +module_param(backtrace_idle, bool, 0644); + bool nmi_cpu_backtrace(struct pt_regs *regs) { int cpu = smp_processor_id(); + unsigned long flags; if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) { - if (regs && cpu_in_idle(instruction_pointer(regs))) { + /* + * Allow nested NMI backtraces while serializing + * against other CPUs. + */ + printk_cpu_sync_get_irqsave(flags); + if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) { pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n", cpu, (void *)instruction_pointer(regs)); } else { @@ -100,6 +110,7 @@ bool nmi_cpu_backtrace(struct pt_regs *regs) else dump_stack(); } + printk_cpu_sync_put_irqrestore(flags); cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask)); return true; } |