Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmasof a mergeable VMA

[Rik van Riel]

On 04/09/2010 03:32 PM, Linus Torvalds wrote:

> Rik? I think it's back to you. I'm not going to bother committing the
> change to the anon_vma locking unless you actually need the locking
> guarantees for anon_vma_prepare().

> And I've got the feeling that the proper fix is in the vma_adjust()
> handling if your original idea was right.

We can fix it on the other side, by changing anon_vma_merge
to actually link all the anon_vma structs into the VMA.

An added benefit is that we are already holding the required
lock (mmap_sem) exclusively in that code path.

I'll cook up a patch and I'll mail it out after a little
testing.
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