Re: [PATCH] mm: thp: Set the accessed flag for old pages on accessfault.

[Kirill A. Shutemov]

On Mon, Oct 01, 2012 at 02:51:45PM +0100, Will Deacon wrote:
> diff --git a/mm/memory.c b/mm/memory.c
> index 5736170..d5c007d 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3537,7 +3537,11 @@ retry:
>  				if (unlikely(ret & VM_FAULT_OOM))
>  					goto retry;
>  				return ret;
> +			} else {
> +				huge_pmd_set_accessed(mm, vma, address, pmd,
> +						      orig_pmd);

I think putting it to 'else' is wrong. You should not touch pmd, if it's
under splitting.

>  			}
> +
>  			return 0;
>  		}
>  	}

-- 
 Kirill A. Shutemov
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