This used to be hidden behind CONFIG_MMAP_ALLOW_UNINITIALIZED, so
userspace wouldn't actually ever see it be non-zero. While I had
originally hoped to avoid hiding it, it looks like this conflicts with
MAP_HUGE_SHIFT so I think it's safer to just keep this 0.
Architectures that want to define
This used to be hidden behind CONFIG_MMAP_ALLOW_UNINITIALIZED, so
userspace wouldn't actually ever see it be non-zero. While I had
originally hoped to avoid hiding it, it looks like this conflicts with
MAP_HUGE_SHIFT so I think it's safer to just keep this 0.
Architectures that want to define
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