tip build broken on sparc64...

[David Miller <davem@davemloft.net>]

It's this pteval_t stuff, probably breaks just about every
other platforms as well.

Please fix this, because I'd like to work on some ftrace
optimizations on sparc64, and do some testing of ftrace
in general.

mm/mmap.c: In function 'vm_get_page_prot_preserve':
mm/mmap.c:86: error: 'pteval_t' undeclared (first use in this function)
mm/mmap.c:86: error: (Each undeclared identifier is reported only once
mm/mmap.c:86: error: for each function it appears in.)
mm/mmap.c:86: error: expected ';' before 'newprotval'
mm/mmap.c:88: error: 'newprotval' undeclared (first use in this function)