On 06/30/2016 06:01 PM, Borislav Petkov wrote: >>>>> #ifdef CONFIG_PREEMPT_RT_FULL >>>>> +static bool notify_work_ready __read_mostly; >>>>> struct task_struct *mce_notify_helper; >>>>> >>>>> static int mce_notify_helper_thread(void *unused) >>>>> @@ -1386,12 +1387,14 @@ static int mce_notify_work_init(void) > > Hmm, what is mce_notify_work_init() ? > > This must be some RT-homegrown thing. > > What it is supposed to do? Upstream is much different from 3.10 or > whatever that kernel version is. The notify work snippet defers the execution of mce_notify_irq to a kthread using swork (simple work, which is based on simple wait [1]). mce_notify_irq() can't be run in IRQ context because of wake_up_interruptible() which calls mutex_lock() eventually with CONFIG_PREEMPT_RT_FULL. cheers, daniel [1] https://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git/tree/include/linux/swork.h?h=linux-4.6.y-rt https://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git/tree/kernel/sched/swork.c?h=linux-4.6.y-rt -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
