Question came up while working on JDK-8262952

We have 4 separate cases in the BSD "pd_commit_memory()" implementation:

#1 __OpenBSD__
#2 __APPLE__ with exec==true
#3 __APPLE__ with exec==false
#4 all other BSD

#1 uses mprotect
#2 uses mprotect
#3 uses mmap
#4 uses mmap

For #2 mprotect must be used, mmap won't work, but for #3 we could use mprotect instead of mmap, so the question is: can't we simplify the code by using only mprotect?