svn commit: r319702 - head/sys/vm

[Alan Cox]

> On Jun 8, 2017, at 2:37 PM, John Baldwin <jhb at freebsd.org> wrote:
> 
> On Thursday, June 08, 2017 12:55:45 PM Bryan Drewery wrote:
>> On 6/8/17 12:18 PM, John Baldwin wrote:
>>> Author: jhb
>>> Date: Thu Jun  8 16:18:41 2017
>>> New Revision: 319702
>>> URL: https://svnweb.freebsd.org/changeset/base/319702
>>> 
>>> Log:
>>>  Fix an off-by-one error in the VM page array on some systems.
>>> 
>>>  r31386 changed how the size of the VM page array was calculated to be
>>>  less wasteful. 
>> 
>> r313186
> 
> Oops.  FWIW, this commit fixes a reliable panic booting mips and mips64
> kernels under qemu.  Adrian also reported the same panic on real mips
> hardware.
> 

Any architecture on which we don’t have superpage reservations enabled could experience the panic at boot time.  Amd64, arm, arm64, i386, and sparc64 would never panic because of the memory allocated for the reservation array.