The attached patch removes the constant definitions of PAGE_SIZE, 
PAGE_SHIFT, and PAGE_MASK, from sys/user.h on architectures that allow 
configurable page sizes.

Additionally, it also removes NBPG, UPAGES, HOST_TEXT_START_ADDR, 
HOST_DATA_START_ADDR, and HOST_STACK_END_ADDR, partly because they are 
defined in terms of PAGE_SIZE, but also because these are only needed 
for trad-core support, and these architecture don't use that anyway.

This has been discussed previously here:

https://sourceware.org/ml/libc-ports/2013-11/msg00028.html

And on bugzilla here:

https://sourceware.org/bugzilla/show_bug.cgi?id=16191

Finally, I've adjusted tst-limits.c so that its PAGE_SIZE test is 
applied to the definitions remaining in other architecture's user.h.

OK?

Andrew