On Mon, Aug 14, 2017 at 11:12 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > The mmap syscall suffers from the ABI anti-pattern of not validating > unknown flags. However, proposals like MAP_SYNC and MAP_DIRECT need a > mechanism to define new behavior that is known to fail on older kernels > without the feature. Use the fact that specifying MAP_SHARED and > MAP_PRIVATE at the same time is invalid as a cute hack to allow a new > set of validated flags to be introduced. While this is cute, is it actually better than a new syscall?
