arm64 ends up having to do:
```#ifdef __x86_64__
#...
# generalb
Benjamin Herrenschmidt
08/20/2020, 11:51 PMarm64 ends up having to do:
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#ifdef __x86_64__
#include <asm/unistd_64.h>
#else
#include <asm/unistd.h>
#endif