Merge branch 'rppt' into docs-next

This contains a set of early-boot memory-management docs from Mike
Rapoport.  It's been circulating on linux-mm for a long time; I finally
picked it up even though it changes a lot of .c files under mm/ (comments
only).

diff --cc Documentation/core-api/index.rst
index 989c97cc232a9da0e9f2c548bbca15d0ba7e3108,93d5a46122a1310c330bcd4b358eeea11c5966f5..b5379fb740a58d1024b35c7d21b7d06f5cb8b98e
--- 1/Documentation/core-api/index.rst
--- 2/Documentation/core-api/index.rst
+++ b/Documentation/core-api/index.rst
@@@ -28,7 -28,7 +28,8 @@@ Core utilitie
     printk-formats
     circular-buffers
     gfp_mask-from-fs-io
 +   timekeeping
+    boot-time-mm
  
  Interfaces for kernel debugging
  ===============================