# Re: \[PATCH 2/2\] mm: introduce MAP\_VALIDATE, a mechanism for for safely defining new mmap flags

- From: Christoph Hellwig \<hch@lst.de\>
- Date: 2017-08-31 10:04:01 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2017/08/6485139
- Thread: https://ratatoskr.run/linux-mm/2017/08/6485134/t.md

```text
> +/*
> + * The historical set of flags that all mmap implementations implicitly
> + * support when file_operations.mmap_supported_mask is zero. With the
> + * mmap3 syscall the deprecated MAP_DENYWRITE and MAP_EXECUTABLE bit
> + * values are explicitly rejected with EOPNOTSUPP rather than being
> + * silently accepted.
> + */

no mmap3 syscall here :)

Do you also need to update the nommu mmap implementation?

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```