Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page

[Vlastimil Babka]

On 9/9/19 10:53 AM, Walter Wu wrote:
> KASAN will record last stack of page in order to help programmer
> to see memory corruption caused by page.
>
> What is difference between page_owner and our patch?
> page_owner records alloc stack of page, but our patch is to record
> last stack(it may be alloc or free stack of page).
>
> Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>

There's no point in separating this from patch 2 (and as David pointed 
out, doesn't compile).

> ---
>   mm/page_ext.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index 5f5769c7db3b..7ca33dcd9ffa 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -65,6 +65,9 @@ static struct page_ext_operations *page_ext_ops[] = {
>   #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
>   	&page_idle_ops,
>   #endif
> +#ifdef CONFIG_KASAN
> +	&page_stack_ops,
> +#endif
>   };
>   
>   static unsigned long total_usage;