printk_kthreads_running
if (printk_kthreads_running && !console_irqwork_blocked)
extern bool printk_kthreads_running;
if (!printk_kthreads_running)
printk_kthreads_running = true;
if (printk_kthreads_running) {
printk_kthreads_running = false;
if (printk_kthreads_running) {
printk_kthreads_running = false;
printk_kthreads_running = false;
if (printk_kthreads_running)
printk_kthreads_running = true;
bool printk_kthreads_running;