Re: [PATCH 1/3] mm/vma: fix incorrectly disallowed anonymous VMA merges

[Lorenzo Stoakes]

On Mon, Apr 07, 2025 at 11:24:19AM +0100, Lorenzo Stoakes wrote:
> Since you seem dead-set on this issue, I think the best solution here is
> just for me to update the comment a little. I'll send a fix-patch.

Actually, re-reading the comment I added:

 * If, at any point, the VMA had unCoW'd mappings from parents, it will maintain
 * more than one anon_vma_chain connecting it to more than one anon_vma. A merge
 * would mean a wider range of folios sharing the root anon_vma lock, and thus
 * potential lock contention, we do not wish to encourage merging such that this
 * scales to a problem.

'If _at any point_' - we already clarify the situation.

So I don't think any change is required here, sorry.