[PATCH] Define MAP_NORESERVE to zero for FreeBSD

[Dimitry Andric]

In http://reviews.llvm.org/D7485#124902, @kcc wrote:

> How does this all work then?
>  We need MAP_NORESERVE on Linux to map 20Tb for the asan process. 
>  What's different on FreeBSD?


The MAP_NORESERVE and MAP_RENAME flags were retired here: https://reviews.freebsd.org/rS273250

Apparently they were never implemented on FreeBSD, at least not with Linux semantics.  As far as I understand, FreeBSD doesn't have the functionality of signalling the affected process, instead of blocking for a page.


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