svn commit: r317567 - head/sys/x86/x86

[Harry Schmalzbauer]

 Bezüglich Conrad Meyer's Nachricht vom 28.04.2017 20:25 (localtime):
> Author: cem
> Date: Fri Apr 28 18:25:10 2017
> New Revision: 317567
> URL: https://svnweb.freebsd.org/changeset/base/317567
>
> Log:
>   x86 MCA: Fix a deadlock in MCA exception processing
>   
>   In exceptional circumstances, an MCA exception will trigger when the
>   freelist is exhausted. In such a case, no error will be logged on the list
>   and 'mca_count' will not be incremented.
>   
>   Prior to this patch, all CPUs that received the exception would spin
>   forever.
>   
>   With this change, the CPU that detects the error but finds the freelist
>   empty will proceed to panic the machine, ending the deadlock.
>   
>   A follow-up to r260457.
>   
>   Reported by:	Ryan Libby <rlibby at gmail.com>
>   Reviewed by:	jhb@
>   Sponsored by:	Dell EMC Isilon
>   Differential Revision:	https://reviews.freebsd.org/D10536
>
> Modified:
>   head/sys/x86/x86/mca.c

Does anybody want to MFC this one before 11.2?

Thanks,

-harry