svn commit: r314216 - head/sys/x86/x86

[hiren panchasara]

On 02/24/17 at 06:56P, Jonathan T. Looney wrote:
> Author: jtl
> Date: Fri Feb 24 18:56:00 2017
> New Revision: 314216
> URL: https://svnweb.freebsd.org/changeset/base/314216
> 
> Log:
>   We have seen several cases recently where we appear to get a double-fault:
>   We have an original panic. Then, instead of writing the core to the dump
>   device, the kernel has a second panic: "smp_targeted_tlb_shootdown:
>   interrupts disabled". This change is an attempt to fix that second panic.
>   
>   When the other CPUs are stopped, we can't notify them of the TLB shootdown,
>   so we skip that operation. However, when the CPUs come back up, we
>   invalidate the TLB to ensure they correctly observe any changes to the
>   page mappings.
>   
>   Reviewed by:	kib
>   Sponsored by:	Netflix
>   Differential Revision:	https://reviews.freebsd.org/D9786

Can this be MFCd to 11?

Cheers,
Hiren
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