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

[Linus Torvalds]

On Sun, 11 Apr 2010, Johannes Weiner wrote:
> 
> Did you have something in mind that I missed?

Mostly that the corner cases will never matter, and I'd prefer to keep the 
code simpler than to care deeply.

For example, the only case you'd see vm_ops->close() is for special device 
mappings. It's true that they cannot have their vma's merged, but it's 
also true that they (a) will seldom have anon_vma's anyway and (b) would 
never get mapped very many times so that anon_vma merging would be an 
issue.

In other words, it's a "don't care" situation, where to keep the code 
simpler we just document that we don't care.

		Linus
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