Re: [PATCH v6 10/16] mm: replace vm_lock and detached flag with a reference count

[Peter Zijlstra]

On Mon, Dec 16, 2024 at 01:53:06PM -0800, Suren Baghdasaryan wrote:

> > That is, should this not live in vma_iter_store*(), right before
> > mas_store_gfp() ?
> 
> Currently it's done right *after* mas_store_gfp() but I was debating
> with myself if it indeed should be *before* insertion into the tree...

The moment it goes into the tree it becomes visible to RCU lookups, it's
a bit weird to have them with !refcnt at that point, but I don't suppose
it harms.