mm: PAGE_KERNEL_* fallbacks

This is the 3rd iteration for moving PAGE_KERNEL_* fallback definitions into asm-generic headers. Greg asked for a Changelog for patch iteration changes, its below.

All these patches have been tested by 0-day.

Questions, and specially flames are greatly appreciated.

v3:

Removed documentation effort to keep tabs on which architectures currently don't defint the respective PAGE_* flags. Keeping tabs on this is just not worth it.

Ran a spell checker on all patches :)

v2:

I added a patch for PAGE_KERNEL_EXEC as suggested by Matthew Wilcox.

v1:

I sent out a patch just for dealing witht he fallback mechanism for PAGE_KERNEL_RO.

Luis R. Rodriguez (2):
mm: provide a fallback for PAGE_KERNEL_RO for architectures
mm: provide a fallback for PAGE_KERNEL_EXEC for architectures

 drivers/base/firmware_loader/fallback.c |  5 -----
 include/asm-generic/pgtable.h           | 18 ++++++++++++++++++
 mm/nommu.c                              |  4 ----
 mm/vmalloc.c                            |  4 ----
 4 files changed, 18 insertions(+), 13 deletions(-)

2.17.0