A while ago we faced a build issue for MIPS architecture (see attached 
config) and someone (forgot who) provided reference to following patch 
which fixed the issue so I applied it in our repo.

commit cd532e6356425fef41f25c31411867cf80d7541b
Author: Maciej W. Rozycki <macro@linux-mips.org>
Date:   Sun May 3 10:36:19 2015 +0100

     MIPS: pgtable-bits.h: Correct _PAGE_GLOBAL_SHIFT build failure

     Correct a build failure introduced by be0c37c9 [MIPS: Rearrange PTE 
bits
     into fixed positions.]:

With a merge of 4.2-rc4 those changes were lost and the build issue was 
back. Is there any chance the patch will be posted upstream in some 
form. For now I reapplied the patch, but would like to get rid of that 
type of maintenance.

Regards,
Arend