Re: [PATCH v3 0/4] initial work on making VMA flags a bitmap

[Andrew Morton]

On Tue, 25 Nov 2025 10:00:58 +0000 Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> wrote:

> We are in the rather silly situation that we are running out of VMA flags
> as they are currently limited to a system word in size.
> 
> This leads to absurd situations where we limit features to 64-bit
> architectures only because we simply do not have the ability to add a flag
> for 32-bit ones.
> 
> This is very constraining and leads to hacks or, in the worst case, simply
> an inability to implement features we want for entirely arbitrary reasons.
> 
> This also of course gives us something of a Y2K type situation in mm where
> we might eventually exhaust all of the VMA flags even on 64-bit systems.
> 
> This series lays the groundwork for getting away from this limitation by
> establishing VMA flags as a bitmap whose size we can increase in future
> beyond 64 bits if required.

All added to mm-unstable, thanks.