Pull more parisc updates from Helge Deller:
 "Two small enhancements, which I didn't included in the last pull
  request because I wanted to keep them a few more days in for-next
  before sending upstream:

   - Replace the ldcw barrier instruction by a nop instruction in the
     CAS code on uniprocessor machines.

   - Map variables read-only after init (enable ro_after_init feature)"

* 'parisc-5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Use __ro_after_init in init.c
  parisc: Use __ro_after_init in unwind.c
  parisc: Use __ro_after_init in time.c
  parisc: Use __ro_after_init in processor.c
  parisc: Use __ro_after_init in process.c
  parisc: Use __ro_after_init in perf_images.h
  parisc: Use __ro_after_init in pci.c
  parisc: Use __ro_after_init in inventory.c
  parisc: Use __ro_after_init in head.S
  parisc: Use __ro_after_init in firmware.c
  parisc: Use __ro_after_init in drivers.c
  parisc: Use __ro_after_init in cache.c
  parisc: Enable the ro_after_init feature
  parisc: Drop LDCW barrier in CAS code when running UP