On Mon, 8 Dec 2014 10:05:28 -0500 Steven Rostedt <rost...@goodmis.org> wrote:
> This code solves the issue of performing stack dumps from NMI context. > The issue is that printk() is not safe from NMI context as if the NMI > were to trigger when a printk() was being performed, the NMI could > deadlock from the printk() internal locks. This has been seen in practice. > One added bonus is that this code also makes the NMI dump stack work on PREEMPT_RT kernels. As printk() includes sleeping locks on PREEMPT_RT, printk() only writes to console if the console does not use any rt_mutex converted spin locks. Which a lot do. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
