Re: [PATCH] mm: fix anon_vma->degree underflow in anon_vma endless growing prevention

[David Rientjes]

On Tue, 3 Mar 2015, Michal Hocko wrote:

> I think we can safely remove the following code as well, because it is
> anon_vma_clone which is responsible to do all the cleanups.
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 943c6ad18b1d..06a6076c92e5 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -774,10 +774,8 @@ again:			remove_next = 1 + (end > next->vm_end);
>  
>  			importer->anon_vma = exporter->anon_vma;
>  			error = anon_vma_clone(importer, exporter);
> -			if (error) {
> -				importer->anon_vma = NULL;
> +			if (error)
>  				return error;
> -			}
>  		}
>  	}
>  

When Michal proposes this on top of -mm, feel free to add my

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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