Merge tag 'xtensa-20170403' of git://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa fixes from Max Filippov:

 - make __pa work with uncached KSEG addresses, it fixes DMA memory
   mmapping and DMA debug

 - fix torn stack dump output

 - wire up statx syscall

* tag 'xtensa-20170403' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: wire up statx system call
  xtensa: fix stack dump output
  xtensa: make __pa work with uncached KSEG addresses