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SubjectRe: [Xen-devel] [PATCH] xen/balloon: add runtime control for scrubbing ballooned out pages
>>> On 06.09.18 at 17:33, <marmarek@invisiblethingslab.com> wrote:
> --- a/include/xen/mem-reservation.h
> +++ b/include/xen/mem-reservation.h
> @@ -17,12 +17,17 @@
>
> #include <xen/page.h>
>
> +#ifdef CONFIG_XEN_SCRUB_PAGES
> +extern bool xen_scrub_pages;
> +
> static inline void xenmem_reservation_scrub_page(struct page *page)
> {
> -#ifdef CONFIG_XEN_SCRUB_PAGES
> - clear_highpage(page);
> -#endif
> + if (xen_scrub_pages)
> + clear_highpage(page);
> }
> +#else
> +static inline void xenmem_reservation_scrub_page(struct page *page) { }
> +#endif

Wouldn't CONFIG_XEN_SCRUB_PAGES then better become
CONFIG_XEN_SCRUB_PAGES_DEFAULT, with the value used as
initializer of xen_scrub_pages?

Jan


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