mmap huge page and MAP_SYNC flag support

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Hi,
How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not compile with that flag on linux 4.15.0-041500rc7-generic #201801072330

Also, how do I make mmap support map size of 2GB or larger, currently the call to mmap fails with mapsize of 2GB.

thanks,

David
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