Re: [mm 4.15-rc8] Random oopses under memory pressure.

[Michal Hocko]

On Thu 18-01-18 18:40:26, Kirill A. Shutemov wrote:
[...]
> +	/*
> +	 * Make sure that pages are in the same section before doing pointer
> +	 * arithmetics.
> +	 */
> +	if (page_to_section(pvmw->page) != page_to_section(page))
> +		return false;

OK, THPs shouldn't cross memory sections AFAIK. My brain is meltdown
these days so this might be a completely stupid question. But why don't
you simply compare pfns? This would be just simpler, no?

> +
> +	if (page < pvmw->page)
> +		return false;
> +
> +	/* THP can be referenced by any subpage */
> +	if (page - pvmw->page >= hpage_nr_pages(pvmw->page))
> +		return false;
> +
>  	return true;
>  }
>  
> -- 
>  Kirill A. Shutemov

-- 
Michal Hocko
SUSE Labs