On 07/06/2016 03:32 PM, Steven Rostedt wrote:
> On Wed, 6 Jul 2016 07:03:43 -0500
> Corey Minyard <cminyard@xxxxxxxxxx> wrote:
>
>>> ---
>>> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
>>> index aaf4b9b94f38..cc70d98a30f6 100644
>>> --- a/arch/x86/kernel/cpu/mcheck/mce.c
>>> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
>>> @@ -1391,7 +1391,8 @@ static int mce_notify_work_init(void)
>>>
>>> static void mce_notify_work(void)
>>> {
>>> - wake_up_process(mce_notify_helper);
>>> + if (mce_notify_helper)
>>> + wake_up_process(mce_notify_helper);
>>> }
>
> Actually, this appears to be the fix in 4.6-rt.
This is in there since it was switched to swork instead of using its
own thread and is also in v4.1:
https://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git/tree/arch/x86/kernel/cpu/mcheck/mce.c?h=linux-4.1.y-rt#n1387
as part of x86-mce-use-swait-queue-for-mce-wakeups.patch. And this
patch was first part of v3.18.9-rt4 as a new patch dropping x86-mce-
Defer-mce-wakeups-to-threads-for-PREEMPT_RT.patch.
> -- Steve
Sebastian
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